Introduction

AFUL, renowned for their innovative, technology-driven IEM designs, has taken a bold leap forward with their latest offering, the Explorer. This IEM represents a departure from their previous models, such as the single BA MagicOne and the hybrid Performer series, by adopting a hybrid driver configuration comprising 1 dynamic driver (DD) and 2 balanced armature (BA) drivers. What sets the Explorer apart is its exceptional bass performance and technical prowess, all while staying true to AFUL's signature tuning. In this review, we'll explore the Explorer's sound signature, technical capabilities, and how it stacks up against other IEMs in its class.



What’s in the box:

• 1 x AFUL Explorer IEM
• 1 x Set of soft white ear tips
• 1 x Set of hard silicone ear tips
• 1 x 1.2m IEM cable with 0.78 2-pin connector (3.5mm or 4.4mm)
• 1 x Carrying case

Specs:

Impedance: 26Ω ± 10%
Sensitivity: 108dB/mW
Frequency response: 10Hz-30kHz
Driver configuration: 1 dynamic driver (DD) + 2 balanced armature (BA)
Cable length: 1.2m
Cable connector: 2-Pin 0.78mm
Cable plug termination: 4.4mm
Effective sound pressure level range: 20-108dB
Technologies:

• 3D pressure balancing technology
• RLC Net frequency division technology
• Self developed wide frequency response balanced armature unit
• Microresonator technology

Unboxing

The unboxing experience of the AFUL Explorer is straightforward and elegant. Upon opening the box, you are immediately greeted by the beautifully designed Explorer IEMs. Beneath the earpieces lies a new AFUL carrying case. The case features a combination of hard and soft materials, with a firm structure on the upper and lower sides and a softer texture around the zipper area. Inside the case, you'll find the cable of the AFUL Explorer and two sets of silicone ear tips. One set is white and made of white, soft silicone, while the other set is darker in color and made of harder silicone. While the provided ear tips are functional, I highly recommend using your favorite ear tips for a more comfortable and personalized experience, as this simple change can greatly enhance your overall enjoyment.

Design and Build
The AFUL Explorer showcases a sleek and contemporary design that underscores the brand's dedication to premium craftsmanship. The earpieces are ergonomically crafted to provide a comfortable fit, even during prolonged listening sessions. Notably, the earpieces are smaller compared to most IEMs in my collection, weighing just 4.2 grams with a nozzle diameter of 5.6mm. This compact size, coupled with its light weight and average nozzle size, ensures a comfortable fit that enables me to enjoy extended listening sessions without discomfort.

Additionally, the IEM features a vent positioned in the outer corner, strategically placed to prevent contact with the ears and ensure the ears don't cover the vent. The detachable cable enhances the IEM's versatility, allowing for effortless replacement or customization. However, the passive noise isolation is average.

The resin earpieces' blue faceplates resemble a galaxy, evoking a stunning visual reminiscent of a starry sky. Overall, the AFUL Explorer's design and construction are not only aesthetically pleasing but also contribute to a comfortable and enjoyable listening experience.


Cable

The provided cable for the AFUL Explorer is a two-wire weave, intertwined and covered with a sheath. It features a light grayish color with a hint of light brown, which may not appeal to everyone's taste, including mine. However, the cable is constructed from quality materials and feels solid. It has no memory effect and does not tangle easily.

Compared to the cable of the MagicOne, the Explorer's cable is a noticeable step up in quality. However, it falls slightly short when compared to the cable of the Performer 5. One downside is that the cable does not come with an interchangeable termination plug, meaning you'll need to choose between a 3.5mm or 4.4mm termination when purchasing.

Sound Signature

Sound signature of the AFUL Explorer could be described as neutral with a bass boost.



Sub-Bass

The Explorer truly excels in its reproduction of sub-bass frequencies. The dynamic driver effortlessly delivers deep, rumbling bass that is not only heard but felt. This adds a sense of weight and authority to the music, creating an immersive experience, particularly in genres like EDM, dubstep, and orchestral music, where sub-bass adds grandeur and scale.

The sub-bass of the Explorer extends well into the lowest frequencies, providing tracks with a sense of depth and dimensionality. This extension makes the music sound more expansive and dynamic. The sub-bass is also well-controlled, with a fast attack and decay that maintains tightness and control even in complex passages.


Mid-Bass

The AFUL Explorer stands out with its impressive bass response, a notable improvement over previous AFUL IEMs. In the past, I found AFUL's bass lacking in impact and attack, particularly compared to what I prefer from a dynamic driver. However, the Explorer completely changes that perception.

The mid-bass of the Explorer is punchy, powerful, and delivers a strong slam. Importantly, it is also clean, well-defined, and textured, enhancing the dynamic range of your music. The bass extension is excellent, reaching the lowest octaves with both quality and quantity. The sub-bass is deep, providing a satisfying rumble that adds depth to bass-heavy tracks.

Whether you're listening to electronic beats or bass guitar solos, the Explorer delivers a bass experience that is powerful, impactful, authoritative, and controlled. Listening to bass-heavy hip-hop tracks is particularly impressive, especially the sub-bass rumble that the Explorer produces when the music drops. AFUL's engineering and tuning prowess are on full display here, showcasing their ability to deliver exceptional bass performance.

I am impressed by the Explorer's bass, especially its controlled nature that caters to a wide range of listeners. The mid-bass of the Explorer is punchy and well-defined, adding a sense of rhythm and drive to the music. It's not overly emphasized, but it has enough presence to give tracks a satisfying thump without overwhelming the rest of the frequency range. This quality makes the Explorer well-suited for genres like pop, hip-hop, and electronic music, where a strong bassline is crucial for the overall groove of the track.

Lower Midrange

The AFUL Explorer's impressive bass performance seamlessly transitions into its midrange, creating a cohesive and engaging sound signature. Thanks to its DD + 2 BA configuration, the Explorer delivers a rich and detailed midrange that truly brings vocals and instruments to life. The midrange is slightly forward, imparting vocals with a strong sense of intimacy and presence. This emphasis on intimacy is a standout feature, making vocals feel remarkably realistic and close.

Instruments are rendered with remarkable clarity and precision, allowing for the subtle nuances of the music to be fully appreciated. There is a subtle amount of mid-bass bleed into the lower midrange, which adds a lush quality to vocals and instruments, enhancing their thickness and richness. Despite this, the effect remains clean, enhancing the lower midrange rather than muddying it.

Male vocals sound particularly thick and lush, while instruments are full-bodied, with thick notes carrying a sense of boldness. This quality is especially noticeable in low piano notes, which exhibit clarity, definition, and a natural sound characteristic of the lower octaves.



The lower midrange of the AFUL Explorer is characterized by warmth and richness, thanks in part to the dynamic driver's contribution. Male vocals benefit greatly from this enhanced lower midrange, sounding full and authoritative. Instruments such as guitars and pianos exhibit a lifelike timbre, with a natural decay that adds to their realism.

Overall, the Explorer's lower midrange adds weight and body to the music, creating a sense of presence and depth. This characteristic makes it particularly well-suited for genres like rock, blues, and acoustic music, where the lower midrange plays a crucial role in conveying emotion and impact.


Upper Midrange

The upper midrange of the AFUL Explorer is a standout feature, offering exceptional clarity and detail that is truly delightful. Handled by the balanced armature drivers, this region of the frequency spectrum is characterized by excellent separation and transparency. Female vocals are particularly impressive, exhibiting a sweetness and clarity that is captivating. Instruments like violins and flutes also benefit, with a sparkle and airiness that enhances their ethereal quality.

This region of the Explorer's sound signature also contributes significantly to its sense of intimacy, drawing the listener deeper into the heart of the music. This quality makes the Explorer particularly enjoyable with vocal-centric music and genres that feature intricate melodies and harmonies. Additionally, the upper midrange plays a crucial role in maintaining the Explorer's overall balance, ensuring that no part of the frequency range feels overpowering or recessed.

In conclusion, the lower and upper midrange of the AFUL Explorer are finely tuned to deliver a rich, detailed, and engaging listening experience. Whether you're enjoying intimate acoustic performances or energetic rock music, the Explorer's midrange performance is sure to leave a lasting impression.


Treble

The treble of the AFUL Explorer is detailed, energetic, and well-extended, contributing to its overall engaging sound signature. The Explorer's treble presentation is particularly impressive, thanks to its dual balanced armature drivers, which handle this frequency range with finesse. The treble of the AFUL Explorer is detailed and extended, providing sparkle and airiness to the sound. Cymbals shimmer with realism, and high-frequency instruments are rendered with precision. The treble is well-balanced, never veering into harshness or sibilance. The treble extension also contributes to the Explorer's sense of balance, ensuring that no part of the frequency range feels lacking or recessed. Overall, the treble performance of the Explorer adds a layer of refinement to your listening experience.


Treble Smoothness and Control

Despite its emphasis on detail and clarity, the treble of the Explorer remains smooth and controlled, without any harshness or sibilance. If you have listened to AFUL IEMs, then you know what I am talking about. This quality makes the Explorer well-suited for long listening sessions, as the treble never becomes fatiguing or overwhelmingTop of Form

Non-Fatiguing Presentation

Despite its detailed presentation, the Explorer manages to avoid harshness or sibilance, even with poorly recorded tracks. This makes it suitable for long listening sessions, as the detail is presented in a way that is engaging and immersive without being fatiguing.


Technical Performance & Detail Retrieval

The AFUL Explorer excels in detail retrieval, offering a high level of clarity and resolution without veering into harsh or overly analytical territory. This balance is achieved through its hybrid driver configuration, which combines a dynamic driver for the lows and two balanced armature drivers for the mids and highs.

The AFUL Explorer excels in detail retrieval, allowing you to hear subtle nuances in your music that you may have missed with other IEMs. The combination of the dynamic driver and balanced armatures ensures that every detail is reproduced with accuracy and clarity.

The Explorer's dynamic driver provides a solid foundation for the music, delivering deep, well-textured bass that adds weight and impact without overshadowing the finer details. The balanced armature drivers handle the midrange and treble with finesse, offering excellent separation and clarity that allow for the nuances of the music to shine through.


Maintaining clarity during busy passages

This is an aspect that differentiates the Explorer to me from other IEMs, it can maintain clarity during busy passages.

Imaging and Soundstage

While the soundstage of the Explorer is not the widest, it is still quite impressive for an IEM in this price range. Instruments are well-placed within the soundstage, creating a sense of space and separation. Imaging is precise, allowing you to pinpoint the location of each instrument within the mix.

Intimate Sound

The intimate sound signature of the AFUL Explorer is perfect for those who enjoy a more personal listening experience. Vocals are front and center, drawing you into the music and creating a sense of connection with the artist. The Explorer excels at conveying emotion, making it ideal for genres such as jazz, blues, and acoustic.

Comparison

AFUL MagicOne

The AFUL Explorer represents a significant upgrade from the MagicOne, particularly in its bass response and upper mid-range performance. While the MagicOne is impressive for a single BA IEM, it falls short in bass depth and can sound slightly shouty in the upper mid-range with higher-pitched vocals and music.

In contrast, the Explorer offers a more balanced and refined sound signature. Its bass, both sub-bass and mid-bass, adds a much-needed fullness and richness to vocals and instruments, enhancing overall clarity and instrument separation. Importantly, the Explorer maintains vocal clarity and instrument separation without ever sounding shouty in the upper mid-range. Overall, the Explorer represents a significant upgrade and improvement in every way over the MagicOne.



Performer 5 vs. Explorer:

The Performer 5 falls short in comparison to the Explorer, particularly in bass depth and vocal intimacy. While the Performer 5 has lower bass and lacks the intimate vocals of the Explorer, the Explorer's vocals are rich and intimate, and its instruments sound full-bodied and detailed. Additionally, the Explorer maintains clarity even during busy passages. However, the Performer 5 still has its strengths, offering more detailed and better-quality treble extension, which results in a more resolving and airy sound compared to the Explorer.


Performer 8 vs. Explorer:

In comparison, the Performer 8 is still the king of resolution and instrument separation, outperforming the Explorer in these aspects. However, the Explorer excels in bass performance, offering better bass compared to the Performer 8. The Performer 8 boasts one of the best treble performances in its price bracket, providing a detailed and airy sound signature.

Truthear Nova

When comparing the AFUL Explorer to the Truthear Nova, the Explorer stands out for its more impactful bass response and slightly warmer overall sound signature. In contrast, the Nova offers a more neutral sound with lower mid-bass and thin vocals, at least to my ears. Both IEMs excel in detail retrieval, but the Explorer's dynamic driver gives it an edge in bass performance, offering greater clarity, quality, and quantity in the lower frequencies.



Kiwi Ears Quartet

When comparing the AFUL Explorer to the Kiwi Ears Quartet, the Explorer stands out for its more dynamic sound signature. The Quartet, in contrast, is much warmer but lacks in detail retrieval and technicalities. The Explorer surpasses the Quartet in several aspects, including clarity, treble extension, detail retrieval, bass texture, vocal reproduction, and imaging.



Simgot EM6L

When comparing the Simgot EM6L to the AFUL Explorer, several differences become apparent. The EM6L exhibits less sub-bass and less impactful bass, which may not reach deep enough for some listeners. The quality of the bass on the EM6L is also noted to be less detailed and textured compared to the Explorer.

Additionally, the upper mid-range of the EM6L can be prone to sounding shouty depending on the music genre. The EM6L features a QDC connector, distinguishing it from other Simgot IEMs. However, despite these features, I prefer other Simgot IEMs over the EM6L.


In contrast, the AFUL Explorer offers a more balanced sound signature that remains smooth and enjoyable across various music genres, never sounding shouty or harsh. The Explorer also provides a more full-bodied and balanced sound compared to the EM6L. While the EM6L boasts more treble extension, giving it a slightly more airy sound, the Explorer is favored for its overall sound quality and balance.


Myer Audio CKLVX D41

The Myer Audio CKLVX D41 is another impressive IEM that has caught my attention recently, despite its higher cost compared to the Explorer. I find it worthwhile to compare these two IEMs because they share some similarities in their sound signatures. Both IEMs exhibit a noticeable bass presence, but the Explorer stands out with its stronger bass slam, impact sub-bass, and more textured bass overall.

One key difference I've noticed is in the treble region: the CKLVX D41 has an elevated treble around the 12K region and higher, resulting in some hi-hats and cymbal strikes sounding splashy. In contrast, the Explorer offers a more intimate sound signature. Detail retrieval is similar in both IEMs, and without having them side by side, it's challenging for me to differentiate between them due to their overall similar sound signatures. This speaks to the quality of the Explorer's sound.



Personally, I prefer the sound of the Explorer because its treble never sounds splashy to my ears, allowing me to enjoy my music without experiencing fatigue. Additionally, the Explorer is much more comfortable to wear compared to the CKLVX D41, as the latter's larger size and elevated earpieces cause discomfort for my ears. The Explorer provides me with a better fit, enhancing my overall listening experience.

XENNS UP

While it may be an unfair comparison, I feel it's important to include the XENNS UP in this discussion because of the striking similarities in tonality between the two IEMs. The main difference lies in the XENNS UP's superior detail retrieval, wider soundstage, and more forward mid-range presentation.



Conclusion

In conclusion, the AFUL Explorer is a standout IEM that offers a unique sound signature that will appeal to a wide range of people. With its powerful bass, detailed midrange, and extended treble, the Explorer delivers a listening experience that is both engaging and immersive. The AFUL Explorer has something to offer to everyone Pair it with a high-quality source and you'll unlock a world of sonic bliss that will leave you craving for more.

Introduction

I recently had the opportunity to try out the Celest Relentless, a 7-driver hybrid in-ear monitor (IEM) known for its exceptional sound quality and craftsmanship. This IEM features a unique hybrid driver configuration, with an 8mm dynamic driver and 6 custom balanced armature (BA) driver units, promising a highly detailed sound quality tailored for audiophiles seeking an immersive listening experience.



If you're interested in purchasing it, you can do so through the following non-affiliate links.

Non-affiliate links:

1. HiFiGo

Unboxing & Accessories

Starting with the unboxing experience and accessories, the Relentless arrives in an elegant blue box with a mythological story about a sea being called the Relentless printed on the back. Upon opening, you're greeted with the two earpieces and a small carrying case. The ear shells are particularly striking, with intricate designs like realistic sea waves. These shells are made by HeyGears, a renowned 3D printing design and manufacturing company known for their high-performance materials and precision design. The shells are crafted from a surface-treated resin, polished to offer a smooth look and feel. While the shells are on the larger side of average, their ergonomic shape ensures a comfortable fit.

The build quality of the Relentless is impressive, especially considering its price point. The ear shells are lightweight, weighing in at just 6 grams, which contributes to their comfort and fit. This attention to detail and quality craftsmanship enhances the overall user experience and reinforces the sense of premium quality associated with the Relentless.



Inside the case, the Celest Relentless comes with a variety of ear tips, including a set of narrow-bore silicon ear tips, a wide-bore set of ear tips, and two sizes of foam ear tips. The silicon ear tips are soft and comfortable, while the foam ear tips significantly alter the sound, as will be detailed in the graphs below.

Additionally, the package includes a golden-colored metal bookmark, which adds a touch of elegance. A well-crafted manual is also included for user guidance.

The provided cable is an 8-wire weave with average thickness, offering a soft and pliable feel. It's designed to resist tangling, a feature appreciated by many users. The cable features screw-in interchangeable terminations, with 3.5mm and 4.4mm options included in the box. The 4.4mm plug comes preinstalled, which simplifies the process of changing the cable termination without needing an adapter. The included cable cinch effectively secures the split wires in place, and two transparent ear hooks are there to help with fit and comfort. The cable terminates in 0.78mm 2-pin plugs, ensuring compatibility with the Relentless IEMs.



Design and Build Quality:

Celest's Relentless IEMs are renowned for their exclusive looks and meticulous construction. Each unit features hand-painted ear shells that add a touch of elegance and individuality, making every pair unique. The 3D printed ear cavities, crafted by HeyGears, ensure a comfortable and secure fit, ideal for long listening sessions.

The attention to detail in the design and build of the Relentless is impressive, reflecting Celest's commitment to delivering a premium product. The IEMs come with a 5N copper silver-plated cable that not only enhances sound quality but also adds durability. The cable is designed with interchangeable plugs,
which adds versatility and ensures compatibility with a wide range of audio sources without compromising on audio quality, allowing easy switching between 3.5mm and 4.4mm connectors to suit your audio source or preference.


Box Contents:

• 1 x Celest Relentless IEM
• 1 x Set of Celest 608 Balanced Narrow Bore Silicon Eartips (S, M, L)
• 1 x Set of Celest 221 Vocal Wide Bore Silicon Eartips (S, M, L)
• 1 x Set of Celest Foam Ear Tips (M, L)
• 1 x Cleaning Brush
• 1 x 8-Wire, 48 Strands of 0.006mm Silver Plated 5N Pure Copper Cable with 3.5mm/4.4mm Interchangeable Plugs
• 1 x Manual
• 1 x Metal Bookmark

Specifications:

Impedance: 27Ω
Sensitivity: 105dB
Connector Type: 0.78mm 2-pin
Frequency Response Range: 20Hz - 20kHz
Cable Length: 1.2m
Plug: 4.4mm + 3.5mm
Cable Cores: 8 cores
Cable Strands: 48 strands of 0.006mm
Cable Diameter: 1.0mm/core

Fit & Comfort:

The Celest Relentless excels in providing a comfortable and secure fit, which is crucial for long listening sessions. The nozzle diameter is 6.4mm to 6.5mm, along with the earpieces themselves being on the average side, I found them to be extremely comfortable. The wide edge of the nozzle helps stabilize the ear tips, contributing to the overall comfort.

Thanks to the 3D-printed ear cavities, the Relentless offers a secure fit that ensures the IEMs stay in place even during extended use. This, combined with above-average passive noise isolation, allows for an immersive listening experience. I can happily say that I wore the Relentless for hours without discomfort, highlighting its comfort and suitability for extended listening periods.



Sound Quality:

The sound signature of the Relentless varies depending on the ear tips used—silicon or foam. With silicon ear tips (wide or narrow bore), the sound leans slightly towards a V-shape, emphasizing technicalities and details. On the other hand, with foam ear tips, the sound signature reduces the emphasis on treble while retaining a similar level of detail.

In terms of overall sound quality, the Relentless offers a satisfying and detailed sound signature across the frequency range. The 8mm dynamic driver unit delivers a solid bass response with good extension, while the Celest customized BA driver units enhance the clarity and resolution of the mids and highs.

The hybrid driver setup of the Relentless results in a pleasing tonality that impresses across the frequency range. The 8mm dynamic driver handles the lows with finesse, providing a rich, deep bass response that maintains control. The Celest custom balanced armature drivers excel in reproducing the mids and highs, offering clarity and detail that unveil nuances in music with exceptional precision.



Bass:

The Celest Relentless impresses with its bass response, offering good texture and depth. The 8mm dynamic driver unit delivers a deep, punchy bass that enriches the overall sound signature. Despite its emphasis on bass, it remains well-extended, providing a satisfying rumble in the sub-bass frequencies without bleeding into the midrange. This ensures a balanced and controlled presentation that doesn't overpower the rest of the music.

The bass of the Relentless stands out for its slam and impact, keeping up with fast-paced tracks and delivering a tight, impactful bass that adds dynamics to the music. Whether you're listening to bass-heavy genres like electronic or hip-hop, or more nuanced genres like jazz or classical, the Relentless handles the bass with finesse, providing a solid foundation for the rest of the sound spectrum.

As I said, one of the standout qualities of the bass on the Relentless is its slam, or impact. The dynamic driver unit of the Relentless is capable of delivering a punchy and impactful bass that adds a sense of energy and excitement to the music. Drums hit with a satisfying thump, while basslines have a sense of weight and presence that draws you into the rhythm of the music.

Overall, the bass performance of the Celest Relentless is nothing short of exceptional for this price bracket. With its powerful and well-controlled bass, tight and impactful sub-bass, and energetic slam, the Relentless offers a bass experience that is sure to satisfy many listeners with the exception of bass heads. Whether you're listening to electronic music, rock, or any other genre that relies on a strong bass foundation, the Relentless delivers a bass performance that is impressive.




Mid-Range

The midrange of the Celest Relentless is another impressive aspect, offering clarity, detail, and a natural presentation that enhances the overall listening experience. This frequency range is where much of the musical magic happens, housing vocals and many instruments, and the Relentless excels in reproducing these frequencies with finesse.

One of the remarkable aspects of the midrange on the Relentless is its ability to handle both male and female vocals with finesse. The airy treble of the Relentless complements female vocals, adding sparkle and clarity that reveal the nuances in the singer's voice. Female vocalists like Adele sound particularly impressive on the Relentless, with a sense of presence and intimacy that captivates the listener.

In contrast, the bass of the Relentless adds weight to the lower midrange, enhancing the solidity and presence of instruments. This weightiness anchors the midrange, ensuring that male vocals sound natural and full-bodied. Male vocalists benefit from this added note weight, sounding rich and textured without being overshadowed by the bass.

Instruments in the midrange also benefit from the Relentless's tuning, with guitars, pianos, and other midrange-heavy instruments sounding detailed and lifelike. The clarity and separation of instruments in this frequency range are particularly impressive, allowing listeners to discern individual elements of the music with ease.
I noticed this aspect when I listened to some of my favorite orchestral music by Hans Zimmer. The bass added depth to the music, enhancing the weight of the notes, while the detailed sound of the Relentless helped keep the music distinct and separate.

Despite the Relentless's impressive bass and treble performance, the midrange remains coherent and integrated with the rest of the frequency spectrum. This integration creates a natural sound signature that is a pleasure to listen to, with each frequency range blending seamlessly into the next.

Treble

The treble performance of the Celest Relentless is a key aspect of its overall sound signature, offering detail, sparkle, and extension that enhance the listening experience across a wide range of genres. The treble on the Relentless is characterized by its clarity and energy, providing a sense of airiness and liveliness to the music.

One of the standout qualities of the treble on the Relentless is its detail retrieval. The IEM is capable of reproducing high-frequency nuances with precision, allowing listeners to hear subtle details in the music that might otherwise be missed. Instruments like cymbals, bells, and high-frequency strings are rendered with clarity and texture.

The extension of the treble on the Relentless is also noteworthy, reaching into the upper frequencies without sounding artificial. This extension adds a sense of airiness to the soundstage, creating a spacious and open presentation that enhances the overall listening experience.

Instruments in the high-frequency range also benefit from the Relentless's treble performance, with guitars, violins, and other high-frequency instruments sounding detailed and lifelike.

Overall, the treble performance of the Celest Relentless is outstanding, offering detail, clarity, and extension that enhance the listening experience across a wide range of genres.

Treble Variation with Silicon Ear Tips

The Celest Relentless has detailed and extended treble. However, with silicone ear tips, the treble may be too pronounced for those extremely sensitive to higher frequencies, especially with certain genres. Silicon tips can enhance treble, making it overly bright or harsh, particularly in classical or electronic music.

To address this, users can try different ear tip materials like foam, known for taming treble and providing a warmer sound. It's essential to experiment to find the best fit for individual ears and preferences.

Overall, while the Relentless excels in treble performance, extremely treble-sensitive listeners may need to adjust their ear tip choice to enjoy its sound quality fully.




Technicalities, Imaging, and Soundstage

The Celest Relentless stands out for its exceptional technical performance, showcasing excellent detail retrieval capabilities that elevate the listening experience to new heights. With its hybrid driver configuration and expert tuning, the Relentless delivers a level of clarity and resolution that is truly impressive.

One of the standout qualities of the Relentless is its ability to reproduce intricate details in the music with precision. Instruments and vocals are rendered with a level of clarity and texture that brings out nuances in the recording, allowing listeners to hear subtleties in the music.

Additionally, the Relentless offers what I would call an average soundstage that provides a sense of space and separation between instruments. This spacious presentation enhances the overall listening experience, allowing listeners to feel immersed in the music.

Overall, the Celest Relentless is a standout performer when it comes to technical performance, offering excellent detail retrieval capabilities that will impress many listeners.

Comparisons

Truthear Nova

Comparing the Celest Relentless to the Truth ear Nova, the Nova's Harman Neutral tuning results in less bass, making vocals occasionally sound thin, especially male vocals. In contrast, the Relentless has better bass, enhancing instrument fullness and providing natural-sounding male vocals. The Relentless also offers superior detail retrieval and technicalities compared to the Nova. Overall, the Nova is suited for those preferring a Harman neutral sound with low mid-bass, while the Relentless caters to listeners seeking impactful bass and enhanced midrange.

Moondrop Kato

Comparing the Celest Relentless to the Moondrop Kato, the Relentless offers a more pronounced bass and slightly better treble extension, giving it a more airy sound. The Kato, on the other hand, has a tighter and more controlled bass and a more neutral overall sound signature. Both are excellent IEMs, but the Relentless may appeal more to bass lovers and those looking for enhanced treble sparkle, while the Kato is better for listeners seeking a balanced and neutral sound.



Moondrop Blesssing 2

Comparing the Celest Relentless to the Moondrop Blessing 2, both are excellent IEMs despite their different prices. The Relentless shares some tuning similarities with the Blessing 2, showcasing its skillful tuning. However, the Relentless offers more bass, upper treble extension, and airiness. In contrast, the Blessing 2 excels in detail retrieval, has less bass, and better imaging capabilities. Overall, the Relentless is ideal for those who prefer a bassier sound with extended treble, while the Blessing 2 is better suited for listeners prioritizing detail retrieval and imaging.



Conclusion

In conclusion, the Celest Relentless is a remarkable IEM that excels in many aspects of its performance. From its powerful and well-controlled bass to its captivating midrange and detailed treble, the Relentless offers a sound signature that is sure to satisfy many listeners. Additionally, its technical performance and excellent detail retrieval capabilities further elevate the listening experience, allowing listeners to hear nuances in their music. With its hybrid driver configuration, expert tuning, and exceptional build quality, the Celest Relentless is a standout choice for anyone looking for a high-performance IEM that delivers on many fronts.

Introduction

Elysian Acoustic Labs is a company I deeply respect and admire. The company is renowned for their commitment to innovation and audio excellence. I own their Elysian Diva and had the opportunity to listen to their Elysian Annihilator 2023, which I consider one of the best, if not the best, IEMs I've ever heard in my 25 years as an audiophile.

Elysian has stated that the Pilgrim inherits some traits from the Annihilator 2023 and DIVA, promising uncompromised lows, mids, and highs at a lower price point.

When I learned that Elysian had a $400 IEM available at CanJam, I had to listen to them. The brand generously allowed me to spend 20 minutes with them, and I was so impressed that I bought them on the spot. After listening to them with various music genres and comparing them to other quality IEMs I own, I am writing this review to share my experience.

The Pilgrim is one of the cleanest IEMs you can find under $400 and quickly became one of my favorite IEMs under $500. Surprisingly, it does not follow the regular Harman target curve 2019 V2 for IEMs but is tuned according to Elysian Acoustic Labs' vision and house sound, with a slight twist.



Note: I bought the Pilgrim from Elysian at CanJam SG at full price, without any discounts or incentives. The opinions expressed below are based on my listening experience and are my own. If you're interested in purchasing it, you can do so through the following non-affiliate links. The Pilgrim is priced at $400.

Non-affiliate links:

1. HiFiGo
2. Aliexpress

Unboxing Experience and Accessories

Let's delve into the unboxing experience and the accessories that come with the Elysian Pilgrim.

The Pilgrim arrives in a standard-sized, cube-shaped box. Upon opening, you're greeted by the IEMs themselves. Beneath the IEMs, there's a note that reads "The First Path," followed by the company's well-known motto, "make no compromises." Beneath these, you'll find the manual and technical specifications. Further down, you'll discover the hard carrying case, adorned with the company logo. The case is crafted from a stitched, white leather-like material that feels cool to the touch and is easy to clean. It is padded on top and hard on the bottom and sides, providing excellent protection against shocks, drops, dust, and water damage. Inside the carrying case, you'll find a set of Spinfit CP100 ear tips and a cleaning brush.

While the case is well-designed, I initially wished it had a zipper to prevent the IEMs or ear tips from accidentally falling out, especially since I often carry my IEMs in a bag. However, the case does not open on its own; it stays shut securely. Additionally, there is a net or mesh inside the case that allows you to safely store your ear tips, brush, and adapters, preventing them from slipping out.

The size of the case is practical for my needs. It is spacious enough to comfortably accommodate a dongle along with the IEMs. However, it may not be pocket-friendly unless you have large pockets. Personally, I appreciate the look and feel of the case.

The package includes:

• 1 x Pilgrim IEM
• 1 x Carrying case
• 1 x IEM cable
• 1 x Cleaning cloth
• 1 x Cleaning brush
• 1 x set of Spinfit CP100 Ear tips (S, M, L)
• 1 x Manual
• 1 x Warranty Card

Here are the specifications for the Elysian Pilgrim:

• Drivers: 4 x Extraordinary Hybrid Design Drivers, 1 x Custom 9.2mm Liquid Silicone Rubber (LSR) Dynamic Driver, 3 x Sonion Balanced Armature Drivers
• Crossover: 3-way Crossover System
• Frequency Response: 10Hz-20kHz
• Sensitivity: 101dB @ 1kHz @ 100mV
• Impedance: 9 Ohms @ 1kHz

Fit and Comfort

Let's begin with the fit and comfort, which are crucial aspects of any IEM, in my opinion. I'm pleased to say that Elysian has paid close attention to this aspect. The earpieces weigh about 6.8 grams each, which is an average weight. They have a nozzle diameter of 6.0 mm at the widest point and a nozzle height of around 5.2 mm.

I typically use XL size ear tips, but I found myself using large ear tips with the Pilgrim. The slightly smaller ear tips allowed for a deeper insertion, which helped me achieve a good seal, crucial for optimal performance. I highly recommend trying the included Spinfits CP100 ear tips, as they provided me with an excellent seal and a balanced, clear sound with great detail.



Once inserted, I found the Pilgrim to be stable in my ears, allowing me to walk without any issues and without feeling them at all, enabling me to fully focus on the music. The passive noise isolation with a good seal is about average, but when listening to music at low volumes, I couldn't hear anything around me.

Build Quality & Cable

The Elysian Pilgrim impresses with its exceptional build quality, crafted from premium 304 stainless steel for both the shell and bores. This choice of material not only exudes durability and elegance but also contributes to the Pilgrim's sonic performance and longevity. The internal chambers are precision 3D printed, ensuring structural integrity and minimal signal distortion.

The cable, made of silver-plated copper, offers a choice of either 3.5mm or 4.4mm termination. I opted for the 3.5mm version, which was available at the time. However, there is no provision for interchangeable plugs, a feature I have found to be quite practical and useful recently. The brand's rationale for this design is that a soldered connection offers a stronger and more reliable electrical conductivity and capacitance, ultimately enhancing sound quality based on their testing.



The Pilgrim features a unique connector on the IEM side called "Pentaconn Ear," resembling MMCX but with improved durability, lower contact resistance, and easier handling. While it's not compatible with MMCX, adapters are available. This innovation, though limiting in cable options, offers a reliable and user-friendly experience.

The cable itself is of high quality, pliable, and tangle-free, with two intertwined cables. It has a perfect thickness, not too thick or thin, and a pleasing shine.
For those seeking cable flexibility, I recommend choosing the 4.4mm version. This allows you to easily use an adapter to convert the 4.4mm to 3.5mm, providing more versatility. However, the reverse is not possible, so it's a one-way option.



Overall, the Pilgrim's build quality, cable design, and connector choice reflect Elysian's commitment to providing durable, high-performance IEMs.


Driver Highlights

The Pilgrim features a custom 9.2mm Liquid Silicone Rubber (LSR) dynamic driver, capable of reproducing low frequencies down to 10 Hz, providing a powerful sub-bass rumble. The use of a Magnesium-Aluminum alloy diaphragm ensures optimal performance and minimal distortion.

The Pilgrim is tuned personally by Lee, the founder and lead engineer, using custom-tailored Sonion Drivers to deliver an incredible and harmonious listening experience.

Sound Quality

The Elysian Pilgrim features a slightly U-shaped sound signature, with a subtle emphasis on the sub-bass and upper treble frequencies, and a slightly lower amount of mid-bass and upper mid-range compared to the second version of the Harman target curve for IEMs 2019.

Designed by Lee and engineered with custom-tailored Sonion drivers, the Pilgrim delivers a coherent and harmonious sound. Its smooth midrange is complemented by dual ultra-tweeter balanced armature drivers, offering extended high frequencies with clarity and brilliance. The custom 3-way crossover ensures a seamless transition between frequency bands, providing a cohesive and immersive listening experience across a variety of music genres.



Analyzing the measurement graph, one notable aspect is the exceptional and nearly flawless driver matching. This highlights Elysian's stringent quality control and dedication to their "make no compromises" ethos, evident at any price point as they promised.


Bass

Let's delve into the bass performance of the Elysian Pilgrim. The Liquid Silicone Rubber (LSR) driver stands out for its ability to reproduce frequencies as low as 10 Hz, surpassing the standard 20 Hz range of traditional PET drivers. This capability contributes to a robust sub-bass rumble.

The Pilgrim exhibits impressive bass extension, particularly in the sub-bass region, outshining the mid-bass. Its sub-bass response reaches deep into the lowest octaves, which became apparent when tested with tracks rich in mid-bass and sub-bass. Here, quality prevails over sheer quantity, with characteristics like punch, slam, texture, clarity, speed, and detail taking precedence. The bass is natural and detail-rich, with a notably strong sub-bass rumble. Listening to Hans Zimmer's "Mountain" track is a revealing experience—the clean sub-bass rumble is deep and impactful. However, I felt that the mid-bass could benefit from a slight boost for a more pronounced slam, although the existing presentation is more than sufficient.

Listening to EDM tracks on the Pilgrim is thoroughly enjoyable. The bass is remarkably clean, revealing details that might have been previously overlooked. The sub-bass rumble is particularly discernible compared to other IEMs. The bass clarity allows for easy differentiation between various bass sounds. I could distinctly hear the clear notes of the bass guitar in my favorite tracks, discerning their tonal nuances more easily. The 9.2mm LSR driver, although slightly smaller than the standard 10mm, delivers a bass output that, while not for bassheads seeking overwhelming quantity, offers a quality that even enthusiasts will appreciate. The bass quality adds depth to piano notes, sounding natural and accurate.



The use of a Magnesium-Aluminum alloy diaphragm in the LSR driver enhances bass performance, providing a lightweight and fast response for precise bass output with minimal distortion. The impact, slam, or thump from the bass response is clean and powerful, ensuring a robust kick without compromising on speed.

In summary, the bass of the Pilgrim can be described as clean, fast, deep, and precise, enhancing the overall listening experience across various music genres.

Mid-range

Analyzing the measurement graph, the Elysian Pilgrim exhibits more energy in the 150 Hz to around 2000 Hz range compared to the standard Harman tuning. This characteristic adds body to instruments, giving notes a weighty, natural timbre. Conversely, there is less emphasis from 2000 Hz to 8000 Hz, deviating from the typical Harman tuning. This unique tuning is intriguing, as it shares some similarities with other IEMs I admire.

Notable IEMs that bear some resemblance, particularly in the 2 kHz to 6 kHz area, include the DUNU SA6 MK II, QDC Anole VX, V14, Gemini, Unique Melody MEST MK II and MEST MK III, 64 Audio U12t, U18s, U18t, and Sennheiser IE600. Elysian's own DIVA and Annihilator also share certain aspects of this tuning.

This tuning allows the Pilgrim to be versatile across genres prone to harsh elements, such as rock, metal, EDM, or some pop, by tempering potentially sharp instruments or vocals.

In practical listening, the mid-range comes across as neutral, without favoring male or female vocal presentation. Male vocals retain their inherent thickness without becoming muddy or unclear. Instead, they sound clean and separated from the music, yet not pushed forward. The vocals exhibit a rare clarity in this price range. Female vocals sound natural, lacking any huskiness or sharpness, with sibilance noticeably absent. With the Pilgrim, even during intense passages in rock music or other genres, the sound never becomes harsh. Whether listening to Metallica, Cello Orchestral Music, or Lindsey Sterling, the Pilgrim remains incredibly detailed, smooth, and natural.

The Sonion 2300 for mids ensures a smooth, versatile midrange response, contributing to a well-balanced, natural sound across various genres.



Personal preference may lean towards slightly forward vocals for greater enjoyment and vocal separation from the mix. While the Pilgrim achieves this separation, the mid-range is balanced with the rest of the frequencies rather than being emphasized. The vocal clarity aids in intelligibility even during complex musical passages.

Additionally, the separation and cleanliness of musical instruments, especially when paired with a resolving DAC/Amp, are remarkable. Electric guitars sound clean with a gritty edge, while acoustic guitar strums are natural and detailed. Piano notes are precise, with each note distinctly separated. The layering and separation are excellent, and fast transients enhance the naturalness and detail of instruments and vocals.

Even when listening to female vocals from artists like Adele, Sia, Billie Eilish, and Taylor Swift, their voices sound natural and free from huskiness, thickness, shoutiness, or nasal tonality, while retaining all the qualities of their beautiful vocals.

In summary, the mid-range of the Pilgrim can be described as neutral, natural, resolving, without harshness or huskiness, and without a specific emphasis on male or female vocals. It is well-balanced and coherent, allowing instruments to blend naturally into the music without being overly emphasized or recessed.

Treble

When I inquired about the tuning process, the brand mentioned they use a combination of measurements and subjective listening. They measure the performance but also listen to the sound, making adjustments if necessary. This approach seems to have paid off, especially in areas I hold in high regard, such as the absence of sibilance or harshness while maintaining resolving power.

Enhancing the Pilgrim's high-frequency performance is the Sonion E50 series, featuring a dual ultra-tweeter balanced armature driver. This component extends high frequencies with exceptional technical capabilities, delivering clarity and brilliance. The IEM also utilizes a custom 3-way crossover, ensuring seamless blending between frequency bands for a coherent sound.

The Pilgrim's low and mid-treble are slightly more restrained compared to other IEMs, while its upper treble or air frequencies are more pronounced. This balance results in a familiar sound that is clear but not harsh, detailed but not sibilant, and resolving yet not fatiguing. The Pilgrim strikes a good balance between micro and macro details, providing a well-rounded listening experience.



The Pilgrim's excellent upper treble extension allows cymbal strikes and hi-hats to sound natural, with the desired definition and shimmer, without being overly sharp or splashy. The treble also contributes to the overall sense of space in the soundstage, creating an airy, spacious feel that's not closed-in or dark.

In summary, the treble performance of the Pilgrim can be described as smooth, detailed, lively, well-extended, with a pleasing amount of shimmer and air at the top. It doesn't come across as excessively airy, maintaining a natural, pleasant character that's easy on the ears over long listening sessions.

Technicalities

The Pilgrim stands out as an exceptionally resolving IEM, showcasing above-average technical prowess that excels in delivering both macro and micro details. This heightened detail retrieval is particularly notable in the bass and treble regions, thanks to its slight U-shaped tonality. Coupled with its balanced frequency response, this characteristic allows you to effortlessly discern every nuance in your music, with details being effortlessly presented to your ears rather than requiring active searching.

Whether the details reside in the bass, midrange, or treble, the Pilgrim presents them abundantly and clearly. This standout feature distinguishes the Pilgrim from other
IEMs, offering a level of detail retrieval typically found in more expensive models, making it a compelling choice for its price point.

Imaging and Soundstage

I find the imaging and soundstage capabilities of the Pilgrim to be slightly above average. Positional cues are distinct and well-defined in all directions, providing clarity and resolution. The effect of the soundstage varies depending on the track, but overall, I found it to be superior to that of most IEMs. There is a notable sense of depth, contributing to an immersive listening experience. Overall, I would describe both aspects as "very good" for IEMs.

Comparison to the Sennheiser IE600

I've observed that the IE600 has a slightly V-shaped sound signature, while the Pilgrim leans more towards a U-shaped tuning. The IE600 excels in bass reproduction, which many, myself included, will find very enjoyable—it's incredibly satisfying. However, the Pilgrim delivers more detailed bass with an excellent textured response. While it may not have the same impact or slam as the IE600, its bass is still highly impressive.



In terms of treble, the IE600 can sometimes be too pronounced for my taste, particularly with rock, metal, and EDM genres. However, it performs admirably with orchestral classical music and pop. Conversely, the Pilgrim's treble is much more to my liking, offering incredible detail without ever becoming harsh or sibilant.

Regarding detail retrieval, I find them quite similar in the mid-range, with the Pilgrim having a slight edge. Moreover, the Pilgrim offers much more detailed bass and higher quality, detailed treble compared to the IE600.

Comparison to the Elysian DIVA

I understand that comparing an IEM that costs four times more is not entirely fair, but I'd like to share my thoughts. There's a significant performance and sound quality difference between the DIVA and Pilgrim, and I wouldn't suggest they are even close. The DIVA simply offers much more clarity, resolution, detail, openness, bass, imaging, and soundstage than the Pilgrim.



However, when listening to both side by side, I can see how the Pilgrim came to be. If we set aside the bass (as the DIVA has three bass switches), the tonality of the Pilgrim is somewhat similar to the DIVA. There are noticeable resemblances in their tuning. This leads me to say that if you're looking to experience the tonality of the DIVA on a budget, or if you want to get a taste of the Elysian house sound without breaking the bank, the Pilgrim is a good choice. The DIVA is essentially a more detailed, natural version of the Pilgrim with significantly more detail, resolution, clarity, imaging, soundstage, cable, and the added benefit of three different bass profiles.



The Pilgrim is like a Mercedes-Benz, while the DIVA is akin to a Rolls-Royce.

Amplifier Pairing

With a sensitivity of 101dB and an impedance of 9 Ohms, the Pilgrim is easily driven and performs admirably with a wide array of audio sources. Despite its 9 Ohms impedance, I found it effortless to drive from various portable dongles and Bluetooth DAC/Amps. It scales beautifully with superior amplifiers, and I recommend a neutral and resolving setup for optimal performance. Thanks to the driver's low distortion, you can experiment with EQ settings without experiencing any audible negative effects. Whether you're using a portable dongle, DAP, or high-end DAC/Amp, the Pilgrim excels in faithfully reproducing music with precision and liveliness.

Conclusion

The Elysian Pilgrim exemplifies Elysian Acoustic Labs' commitment to pushing the boundaries of audio technology. With its innovative design, exceptional build quality, and captivating sound signature, the Pilgrim offers a listening experience that is both technically impressive and emotionally engaging. For audiophiles and music enthusiasts looking to embark on a sonic adventure, the Pilgrim is a worthy companion that promises to unlock new paths to musical enjoyment.

I would describe the Pilgrim as very natural, coherent, harmonious, balanced, slightly U-shaped, well-tuned, and resolving. It doesn't emphasize any specific frequency, delivering an even sound that offers an excellent amount of micro and macro details, dynamics, with a clean, clear presentation as the standout feature. It is an excellent IEM and definitely earns my recommendation. Good luck to the Elysian team. I think they hit a home run with this one, and I can't wait to see what IEM they have next.

This is my first review guys, so go easy on me.

Note: This review is based on the included blue nozzle.

Introduction:

DUNU has long been synonymous with premium sound quality and craftsmanship in the audiophile world, and their latest offering, the Falcon Ultra, continues this tradition. This review will explore its design, accessories, and most importantly, its sound performance.

Design and Build:

The Falcon Ultra boasts a sleek and premium design with earpieces made of high-quality stainless steel. The earpieces sit almost flush against your ears, providing a comfortable fit ideal for extended listening sessions. The use of Patented Catch-Hold MMCX Connectors adds to the durability and security of the design, ensuring a reliable connection.


Accessories:

DUNU has set a new standard with the Falcon Ultra's accessories. The package includes a luxurious zipper case, a variety of ear tips including DUNU candy and S&S tips, interchangeable tuning nozzles, and a DUW-02 PRO cable with Q-Lock LITE system that allows for easy swapping between 3.5mm and 4.4mm jacks. The attention to detail and practicality of the accessories enhance the overall unboxing experience and value proposition of the Falcon Ultra.




Sound Quality:

The Falcon Ultra delivers a sound signature that is both engaging and enjoyable, leaning slightly towards a fun and dynamic presentation rather than neutrality.

Bass Performance:

The bass response of the Falcon Ultra is a standout feature, offering a rich and impactful low-end that adds depth and energy to the music. The bass is visceral and impactful, providing a solid foundation to the music. The sub-bass extension is excellent, providing a visceral and immersive listening experience. Despite the emphasis on the mid-bass, the Falcon Ultra maintains a detailed and satisfying bass response.

Midrange and Vocal Performance:

The midrange of the Falcon Ultra is beautifully balanced, with a slight emphasis that adds warmth and richness to vocals and instruments. Male vocals benefit from the added warmth, giving them a full-bodied and intimate quality. The upper midrange is smooth and natural, adding a sense of realism to female vocals and instruments. The synergy between the bass and midrange creates a cohesive and engaging sound signature that is a pleasure to listen to.


Treble Performance:

The treble of the Falcon Ultra is finely tuned, offering a balanced and extended high-frequency response that adds detail and air to the sound signature. The treble presentation is smooth and well-controlled, avoiding harshness or sibilance. High-frequency nuances are rendered with precision, allowing for a truly immersive listening experience.

Imaging and Soundstage:

The Falcon Ultra's imaging is precise, with instruments and vocals placed accurately within the soundstage. The soundstage is intimate, with sounds surrounding you in a close and engaging manner. This, combined with the enjoyable vocals, impressive low end, and lack of harshness, makes the Falcon Ultra a truly enjoyable IEM.



Comparison of Nozzles:

The Falcon Ultra comes with interchangeable tuning nozzles, including blue and gold-plated brass options. The blue nozzles offer a more balanced sound signature with a focus on detail across all frequencies with a mid-bass emphasis. However, switching to the gold nozzles results in a noticeable change in sound. The gold nozzles reduce the upper midrange and treble, resulting in a smoother, more laid-back sound. While this tuning enhances the bass presence, it can make vocals feel more distant and the overall presentation less engaging. The focus shifts entirely to the mid-bass, which may appeal to listeners seeking a warmer, more relaxed sound but may not suit those looking for a more balanced sound..



Comparison to Moondrop Kato:

Compared to the Moondrop Kato, the Falcon Ultra offers more bass and a more engaging sound signature. The Falcon Ultra adds warmth to vocals, making them more exciting, while the Kato has slightly leaner vocals. The Falcon Ultra's soundstage is more intimate compared to the Kato's slightly wider soundstage. In terms of accessories and build quality, the Falcon Ultra comes out ahead with its interchangeable cable and a wider selection of ear tips.

Conclusion:

In conclusion, the DUNU Falcon Ultra is a standout performer in the mid-fi IEM market, offering exceptional sound quality, premium design, and a comprehensive accessory package. It sets a new benchmark in its price range and is a top contender for anyone looking for a high-quality, engaging listening experience.