Spirit Torino IEM TWIN PULSE BERYLLIUM

SPIRIT TORINO TWIN PULSE BERYLLIUM IEM- A Concentration of Technology at the Service of Music​

Introduction: -

Spirit Torino is an Italy-based audio company founded by Andrea Ricci. It all started with collaborations with hi-fidelity stores in 1993 in Turin, Italy which is known for its numerous art galleries, restaurants, churches, palaces, opera houses, piazzas, parks, gardens, theatres, libraries, and museums. After starting with a series of electronic cabinets and pedestals crafted from mahogany and walnut in 1995 to becoming a record label for recording concerts in 2002, in 2007 they first began with modifying closed and open-back commercial headphones. Fast forward to 2014 Spirit Prototyping Laboratory was born to rework a significant quantity of headphones to meet the needs of audiophiles. Moving on to 2017 after lots of research and development the founder assembled the prototype of Twin Pulse, which became the first isobaric motor unit for headphones in the world. Spirit Torino presented “Radiante” in 2019 at the Tokyo Headphone Festival: the first headphone in the world with an external passive radiator, winning second and third place in the competition in April with the Super Legerra and the Twin Pulse and first place in November with the Radiante.

Today we will be reviewing SPIRIT TORINO TWIN PULSE BERYLLIUM IEMs at Aural Cafe which is SPIRIT TORINO’s first attempt at making a high-fidelity in-ear monitor.

Spirit Torino Twin Pulse Beryllium IEM launched in 2023 is Spirit Torino’s first offering in the world of hi-fi IEMs after coming up with many flagship headphones. Twin pulse beryllium is powered by 2 x 10mm dynamic micro drives Beryllium dynamic drivers in Spirit Torino’s patented twin pulse isobaric system (Cone to magnet setup) which is currently the hottest setup in today’s Audiophile world. Isobaric setup was prominently used in speakers but now many respected audio companies are implementing the same in their headphones and IEMs. One can read more about the isobaric setup through this link: https://vue-audiotechnik.com/isobaric-subwoofer-design/.

According to Spirit Torino, this setup helps in overcoming the transient speed issues of dynamic driver-based IEMs. Moreover, twin Pulse offers playback linearity calibrated on isophonic Fletcher-Munson curves (of equal sensitivity to the human ear) and can therefore be used as a reference tool to verify the timbre reliability of a recording. Spirit Torino Twin Pulse Beryllium IEM is priced at US$ 850.00.



Specifications: -

• Driver Technology: Twin Isobaric System
• Driver Configuration: 2 Dynamic Driver (10mm Beryllium micro drives)
• Impedance: 16Ω ± 10%
• Freq Response: 14Hz-33Khz
• Sensitivity: 114dB/mW @1kHz
• Cable: 1.2m Litz 392 Cores OCC Silver-plated + 8 Cores Silver
• Max Power Rating: 2mW

Disclaimer: -

We have received a small discount, and we are thankful to the amazing team at SPIRIT TORINO for it. We were also delighted with the opportunity to review it. However, the review reflects our honest opinions as always.

Packaging & Accessories: -

• Spirit Torino Twin Pulse Beryllium IEMs
• 7 pairs of Ear-Tips (Silicone, Memory Foams and Dual Flange)
• IEM Cable with 3.5mm Termination
• IEM Cable with 4.4mm Termination
• 3 Different Nozzle Filters
• 6.35mm Adopter Jack
• Leather Carry Box and Cleaning Tool
• Documentation

Check out the full unboxing video here,







IEM Build, Design & Fit: -

Coming from Turin, Italy, famous for its art galleries and museums, the team at Spirit Torino didn’t disappoint us from the very moment we unboxed. Everything inside the box from the IEMs to the cables, the carrying case, to the ear tips screams art and craftsmanship from the very go. We at Aural Cafe are pleasantly surprised by the quality of accessories rare to find in the sub-1000 US$ range. Even the packaging they’ve used very high-quality materials.



The IEM shell boasts of lightweight aluminium structure machined by high-precision CNC machinery, to rebuild the complex Twin Pulse isobaric system in miniature form. The proprietary complex Ventilated Pad system earlier implemented in Spirit Torino headphones evolved into the Micro Ventilation Pad System as it was necessary to rethink the micro-frame from scratch to calibrate the complex interplay of pressures generated in the acoustic chambers of the Twin Pulse system to ensure the dissipation of the extra pressures when inserting the In-ear monitor into the ear. The Micro VPS also allows the audiophile to select different sound signatures according to their needs by changing the provided three pairs of front filters. The IEM is designed in bullet form which is unique and will surely have a love-hate relationship with the different audiophiles. In our case, we did find it a bit difficult to use initially but after bending the IEM hooks slightly inward we were good to go and had no difficulties. The IEM is light in weight and provides above-average isolation. The artistic faceplate clones the Spirit Torino legendary Valkyria headphones and is actually a functional part of the driver setup.



Inside the Twin Pulse, employs two identical 10mm micro drivers with powerful neodymium magnets and Beryllium-treated membranes to act synchronously over the entire audio range, zeroing out typical micro-acoustic problems and dangerous phase interference without any crossover to minimize any kind of distortion. It comes with two sets of custom-made Litz SPC cables in 3.5 and 4.4 terminations along with a custom-made high-quality 6.3mm jack adapter. We are very surprised by the thoughts, research and development that has gone into designing each section of the IEMs and accessories in this beautiful piece of art which is “Made of Sound”.



Sound Analysis: -

Credits: Spirit Torino Officials

• Tonality: - From the very moment we put on Spirit Torino Twin Pulse Beryllium we are amazed by its unique yet musical and immersive hi-fi experience. The stock high-quality SPC cable also adds to the musical tonality of the IEM. According to the team at Spirit Torino, it is tuned for both audiophiles and professionals in the field of music who can use it for mastering and post-production. The tonality is borderline neutral with a musical tinge to the whole experience. The timbre of the instruments is lifelike real, and the IEM successfully takes us inside the live concert. We like the neutral grey filter in this regard, with the memory foam tips. There is a sense of control and yet at the same time lows, mids and highs flow like a river. The tonality is natural organic and fun.
• Lows: - With the implementation of the patented twin pulse isobaric system, the lows are surprisingly natural, organic, and dynamic in every respect. The bass is subtly tuned without any hint of muddiness in Mids. The bass not only has the right quantity and quality but exceptional control and speed all thanks to the unique isobaric system. While the red tuning nozzles add up to 3 dB of bass the black nozzles can reduce the same by 3 dB and can be helpful while listening to jazz. The mid-bass with red tuning filter sounds very fun and immersive while listening to EDM whereas the same is beautifully balanced on the grey reference filter (our favourite tuning filter). It comes a bit forward on the red filter. The sub-bass with just the right layering shows up beautifully while listening to the EDM genre, especially on the red filter. While listening to Starboy by the Weekend and Nakshatram by Jean du Voyage on Dethonray SG1 Gold with the black tuning filter the mid-bass is hard-hitting and deep with effortless sub-bass and solid male vocals. The bass on the black tuning filter is a bit light and becomes handier for audiophiles who strictly love reference-tuned IEMs.
• Mids: - The Mids on the IEMs are top tier with the right energy, resolution, and soul. The vocals are natural and organic without losing any control even in complex tracks. The Mids are more referenced in grey tuning filter and black while a tinge forward with the red filter. The IEMs show their power with solid lower Mids and male vocals in complex rock, metal, and Hip-Hop tracks. We loved listening to Godzilla by Eminem (grey tuning filter) with stock cable and silicone tips in Dethonray DTR1+ while with a tinge more resolution, the female vocals shine with black tuning filter, wide bore silicone tips in Aune M1p pairing with the Linum SuperBax cable setup. Michael Jackson’s Thriller would give you the thrill you might have missed before in this.
• Highs: - The Highs on the Spirit Torino Twin Pulse Beryllium are tuned in a very reference and balanced way (In Grey filter). The mid treble has decent sparkle and air keeping in mind the reference tonality of the unit. We at Aural Cafe love the treble on twin pulse beryllium with the grey filter, whereas it becomes a touch more transparent with the black filter and a bit warmer with the red filter. The treble remains organic and smooth across the high frequency without any sharpness where solid micro details are showcased more naturally and effortlessly. The treble is sweet along the transient response is super immersive and unique which hits the right point the same is showcased while listening to Yosi Horikawa’s Swashers, with PW Audio Monile Two Wire + Aune M1p + Spinfit CP145 tips.
• Soundstage & Imaging: - The Soundstage on Spirit Torino Twin Pulse Beryllium is top tier in both width and depth all thanks again to the patented twin pulse isobaric system. While listening to ‘Koi Faryaad’ a Hindustani Classical Ghazal by the great Jagjit Singh the highs as well as the lows hit just the right point without any lack ness especially in depth. the soundstage depth is where most sub-1000 US$ items really don’t shine but we loved the way it handles in Twin Pulse Beryllium IEMs and becomes handy, especially with the different genres of music. The Imaging on Spirit Torino is again top notch which is beautifully showcased while listening to ‘Shakti’ from Five Peace Band. Layering is showcased with solid control whenever needed in the track. We believe that the high-quality beryllium dynamic driver also helps a lot with sound staging and imaging. The soundstage becomes a tinge more open with Spinfit W1 tips.
• Synergy: - The Spirit Torino Twin pulse beryllium IEMs come with a decent 114db of sensitivity which makes it fairly easier to drive. It can become useful while walking and listening to music on the move with a decent dongle such as Aune Yuki or Hidizs S9 Pro Plus. But if you want to see the true colours we would suggest listening to Spirit Torino IEMs with a transparent DAP. It scales a lot with different sources, cables, and tips due to its true reference nature. We loved it a lot with the Dethonray DTR1+ and stock cable which to our surprise really complemented the reference tuning of the Twin Pulse Beryllium IEMs. When it comes to ear tips, we love the way it sounded with Spinfit CP145 although the stock tips also efficiently do their work. We also suggest using a high-quality cable such as PW Audio Monile two-wire version if you want to extract more from the unit.

Conclusion: -

Being in this hobby for the last 8 years we audiophiles at Aural Cafe are lucky and blessed to own and audition numerous high-quality items from different brands across the world. Well, each audiophile has their taste for IEMs and headphones, we believe that the actual quest for every audiophile in this hobby is to be able to listen to different flavours that sound top tier and yet have their uniqueness and identity which is very very rare to find. We can happily say that Spirit Torino Twin Pulse Beryllium IEMs is one such gem that sounds truly reference yet unique with its own soul. From the unboxing to the built quality and accessories the team at Spirit Torino has worked hard to present their first attempt at building a top-tier IEM and that also at a reasonable price of 850 US$. Although the bullet housing design of the IEMs is subjective, if you are in search of an IEM that sounds unique yet reference this as an easy recommendation from us at Aural Cafe. If they could have made it in a more conventional design IEM, it would be absolutely flawless.

Non-Affiliated Link: -
- https://www.spirittorino.com/en-us/collections/high-end/products/iem-twin-pulse-berillium

Spirit Tornio Twin Pulse Beryllium: A Balanced Assessment

Introduction

The Spirit Tornio Twin Pulse Beryllium IEM is the first Inner-Ear Monitor (IEM) produced by the Italian luxury headphone maker Spirit Torino. In this review, I aim to comprehensively evaluate these IEMs, with a special focus on their sound quality. We will delve into the design, build, comfort, and practicality, but let's start by examining what these headphones bring to the table in terms of audio performance.
I would like to take the time, and thanks, Andrea, the owner and chief designer of Spirit Tornio, for loaning me this IEM; at the end of the review, it will be going back to Italy.

View attachment DSC01709.JPG

Methodology:

When it comes to evaluating the sound quality of headphones/IEM, there's often a wealth of detail to explore. As a hobbyist, I’ve been in this hobby for long enough to know from first listen whether I will quickly mesh well with a product. However, when I want to evaluate the product from a viewpoint other than mine, things can get rather complicated. While as much as I like to stay neutral, my personal sonic performance will play a significant part.

Equipment used:
DAP: Luxury Precision LP6 Gold (where stated: Hiby RS8, RS6, WM1AM2).
Tips: AZLA Xelastec.
Cable: Stock cable with ear hook removed.
Nozzle: Silver reference nozzle.
Music:
DAWN FM, The Weeknd (R&B, POP, Dance).
Djesse Vol.1, Jacob Collier (Male vocal Jazz, A cappella).
Sex, Dope & Cheap Thrill, Big Brother & The Holding (Rock).
A Love Supreme: Live in Seattle, John Coltrane (Jazz).
Breathless, Schiller (Electronic).
Screw rework, Nils Frahm (Electronic).
So in Love, Roberta Cambarnini (Female Vocal Jazz).
Violin on Stage, Bomsori (Classical).

Ergonomics/Design

Design purpose: Beyond sound quality, the practical aspects of headphones are equally important. You might ask who the main target audience of this product is: professional users. Twin-pulse was designed for anyone needing an IEM for mastering post-production and live monitoring. The inclusion of wire in the cable will be a giveaway to the keen eyes.
Outside of your typical custom IEM, which are all balanced armature designs, needing a complicated crossover design, almost costing many times more than, no other IEMs have taken the Spirit Torino approach of professional, live mastering.
Andrea designed this reference based on his philosophy of reducing dynamic driver weakness and keeping its strength. Andrea's view is the limitation of the dynamic driver is the speed in transients from the dynamic driver while keeping it inherits coherency.
The Twin Pulse Beryllium offers commendable noise isolation, mainly due to its secure fit and the inclusion of foam tips. This ensures that external noise is effectively reduced, allowing for an uninterrupted listening experience. The comfort during extended use is also satisfactory once you are able to take the time needed to adjust the metallic wire. These headphones are designed to be worn for long periods without causing discomfort or listening fatigue.
But I’m not a professional user; I listen to my IEM mostly while lying on grass outdoors, on my bed, or on the sofa. So, for me, the metal wire causes frequent seal breakage. So, I simply removed it, which was easy.



Cable: Twin Pulse uses QDC-style 2-pin connectors, ensuring a secure cable connection. However, it is compatible with any 2-pin cable.

I found the stock cable adequate, and cable rolling did not make as much of a difference as finding the right tup.

Fit and Tips: Three things I did to Twin Pulse to improve fit were:
1) Use Azla Xelastec tip,
2) Use a shirt clip and
3) Remove cable wire.

Getting the right fit on Twin Pulse will take some playing around, and sadly, upon first listening, when you are trying to make a decision in the store, during auditioning, will result in very poor first impressions. I hope Andrea looks to improve on this in future revisions.

Sound Quality: A Deep Dive

Overview:

This item is ideal for those who listen to small chamber classical pieces or anything that does not require a large sound stage. The sound is fast, and bass decay is natural, albeit not syrupy like some other dynamic drivers, thanks to its Beryllium feature.
The sub-bass is deep and hit hard when the recording asks for it. The treble is well-extended and never harsh.
Its major weakness is the lack of horizontal spread, which becomes too much in your head for some classical larger orchestral pieces.

Listening to So in Love by Roberta Gamarini, I feel like I’m in the recording studio, hearing the recording directly from the near-field speakers. Thankfully, the magic does not disappear when I listen to the track Overture performed by Jacob Collier in his album Djesse Volume 1; I can understand all the musical elements within the recording, thanks to its well-mastered album. However, with poorly recorded albums, the sound tends to collapse. This is less obvious in IEMs like my Sony IER-Z1R, which it is built to mimic a certain sound, this issue is less obvious. Is it the fault of Twin Pulse? No, as they are designed to be mastering IEM, if the mastering is bad, it will show it. However, for audiophiles who want to enjoy Hi-Fi speaker sound in an IEM format, this can be an issue, and it is my responsibility to highlight this aspect of Twin Pulse.

Bass:

The low end, or bass, in the Twin Pulse Beryllium, is a notable aspect of their sonic signature. These headphones deliver a deep bass response that is tight and impactful. It's not an overwhelming, chest-thumping mid-bass focused but rather a controlled and precise one.
This characteristic is especially appealing to those who appreciate a balanced presentation. While it may not cater to bass enthusiasts seeking a pronounced thump, it effectively complements the overall sound signature. The Twin Pulse Beryllium manages to provide a sense of depth and warmth to the music, enhancing the listening experience. This quality becomes obvious in track Mi, in the album screw rework by Nils Frahm. The track has a deep that shows its quality and impact from Twin Pulse.

Mids:

One of the standout features of these IEM is their midrange performance. The mid frequencies are where vocals, guitars, and many key instruments reside, and the Twin Pulse Beryllium handles them with grace. Vocals are presented with a level of clarity and forwardness that stands out. The vocals are natural and lifelike, never nasal or sibilant.

Instrument separation in the midrange is another area where these headphones excel. Whether it's the strumming of an acoustic guitar, the resonance of a piano, or the timbre of various instruments in a complex arrangement, the Twin Pulse Beryllium delivers a rich, textured audio experience. The ability to discern subtle nuances in the midrange adds depth and complexity to the music. This feature is particularly appreciated by those who enjoy dissecting the intricacies of their Favorite tracks.
Solo instrument tracks are no issue. This becomes apparent when listening to Bomsori performance on her new album, Violin on Stage.

Highs:

Moving to the high frequencies, the Twin Pulse Beryllium offers a clear and crisp presentation. High-frequency instruments like cymbals, bells, and chimes are rendered with precision. The treble maintains a controlled character, avoiding harshness even at higher volume levels. It's worth noting that these IEM aren't overly bright or piercing, which might appeal to those who favour a smoother treble response.

Soundstage:

The soundstage of the Twin Pulse Beryllium is the only aspect I wish it could do better. I think it is important to remember once again that Twin Pulse is designed for professional stage usage, where a single focus on one instrument is critical. From that point of view, you cannot fault this IEM, however. from an audiophile point of view, it leaves room for the desire for a wider, more expansive soundstage.


Source comparability:

Switching between Hiby RS6 and Luxury Precision LP6 Gold, I noticed that both dap maintained the tonal balance of Twin Pule, but only thing that changed is the tonal decay. With RS6, one would be tempted to say the sound has become warmer, while LP6 Gold remains clear and sharp.

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I normally can easily explain changes perceived while I DAP roll and recommend a DAP based on how it is able to enhance the good qualities of the IEM.
With Twin Pulse, DAP rolling does not alter the IEM overall tonal balance; the soundstage remains the same, but how the bass decays (or, in that sense, treble) alters.

If you want a slower decay, go with RS6, but if you want that sharp finish and precise decay, go with a more balanced DAP.

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Conclusion:

As we've explored the various elements of the sound quality of the Twin Pulse Beryllium, it's clear that these headphones strive for a balanced presentation. They don't emphasize any specific frequency range to an extreme degree but aim to provide a well-rounded listening experience with a professional focus.

However, it's important to acknowledge that the term "balanced" can be subjective. What some listeners might interpret as balanced, others might perceive as lacking excitement or energy. The Twin Pulse Beryllium favours a more controlled and precise presentation, which many appreciate but might not satisfy those who prefer a more aggressive or analytical sound.

In conclusion, the Spirit Tornio Twin Pulse Beryllium IEM is a balanced offering with strengths in the presentation of the natural timbre of the instrument. It shines when the music is not overly crowded.

Spirit Tornio has crafted a pair of IEMs that cater to discerning listeners, and the Twin Pulse Beryllium represents a step in that direction. Whether these headphones align with your audio preferences depends on your taste and expectations.
This is a solid first attempt in my books, and it is amongst the most competently designed dynamic driver-based I’ve tried this year.

Interview with the designer:

I wanted to ask Andrew some questions about what led him to design this IEM, I would like to thank Andrea for his time once again.

Audionewbi: “What was the initial inspiration for creating these IEMs?”

Andrea: “My clients have made me listen to a lot of IEMs, but I have always found big problems with the naturalness of the sound.

I thought that if I could miniaturize our Twin Pulse patent, it could be a solution to this problem.”

Audionewbi: Can you describe the key design and performance goals you aimed to achieve with these IEMs?

Andrea: “The goal of this headset is to get a reliable recording monitor that could be alongside the Valkyria.

Each of our headphones must have the ability to be credible in comparison with live listening.

Audionewbi: What was the research and development process like for these IEMs? Did you try different metal finishes?

Andrea: “The research and development process of this IEM is based on the knowledge gained during the experimentation of Valkyria, which is our headphone that comes closest to live sound.

A listening committee made up of the conductor, artistic director, Spirit staff and the audience, after a few minutes, compares the real sound with the sound reproduced by our headphones.

Each member of the committee has its own perspective and analyses the outcome.
Stabilised aluminium is the best material to make this product after Stabilized Titanium.”


Audionewbi: “What materials and components were chosen for these IEMs, and how do they contribute to the product's sound quality and durability?”



Andrea: “To stabilise aluminium in this project, we could not use the Dynamat because the dimensions did not allow it; consequently, I studied a different stabilisation system:
Texalium + elastic bi-adhesive sheath dampens the resonance frequency of aluminium, resulting in a similar result.

These are materials whose behaviour has already been tested in other projects over time.”

Audionewbi: “Were there any significant technical challenges you had to overcome during the development process?”

Andrea: “Yes, of course, the miniaturisation of our patent was not easy because it provides for the balance between external and internal pressures so that the movement of the mobile group is also braked in both directions.



This means we had to devise a different way to achieve this balance.



We had to insert a series of outsides into the frame that were covered by paper filters with thickness differences to find the right sound balance.


This process always passes through the comparison between the real sound of an instrument or a voice and the one reproduced, but absolutely not by the measures that do not give any indication of the quality of the sound.


Our development is very similar to that of a musical instrument rather than a classic high fidelity instrument.”


Audionewbi: “Spirit Tornio began as a headphone company. Did any of that philosophy make its way to your IEM, or do you have a different design philosophy for your IEM?”


Andrea: “Let's start from the fact that headphones and earphones are profoundly different, but they must achieve the same result, that is, to deceive our brain that they are listening to a real concert and not a reproduction of the concert.

Spirit pays particular attention to voice reproduction.

At the end of the listening sessions with the committee, I spent a lot of time listening to the human voice of a TV series, alternating headphones and earphones to see if there were any substantial differences in the way the voice is reproduced.”

Audionewbi: “Your headphone lineup is composed of different tiers of headphones. Will you be having a similar class for your IEM?”

Andrea: “For the time being, we will take advantage of the experiences gained in this project to understand how to push the reproduction quality of the earphones even higher.

We are experimenting with different cabling solutions and tips.”

Spirit Torino is a high-end headphone manufacturer from Turin in Italy. The company is very well known for its top-of-the-line Valkyria headphones, which are considered by some audiophiles to be perhaps the best headphones in the world. Technologies, such as the arrangement of the driver in the form of a revolver course with a massive arrangement of 13 neodymium magnets with a strength of 2x13.8KG make it a uniqueness in the field of high-end headphones. Spirit Torino has been exclusively making headphones until now. Now their very first IEM is coming to the market, the Twin Pulse IEM Beryllium. From the technical data you can already hear that technologies are also used here, which have never been used in any IEM!

The patented Twin Pulse Isobaric System for headphones is also used in the IEM to maximize acceleration and control of drive movements here as well. The IEM is entirely CNC machined from aluminum and provides maximum comfort and sound attenuation through complex management of pressure flows. Resonances are treated by damping with Dynamt Tm and transient response is improved by a so-called Pad VSP system. Twin Pulse represents a reproduction linearity calibrated on isophonic Fletcher-Munson curves (with the same sensitivity as the human ear) and can therefore be used as a reference instrument to check the timbre reliability of a recording. The whole Twin Pulse unit consists of a total of 2 identical 10mm dynamic drivers coated with beryllium as well as powerful neodymium magnets. Both drivers operate synchronously over the entire frequency spectrum to eliminate phase interference. As with other IEMs with tens of drivers, no crossover is necessary here, so that overlaps in the sound are excluded.



Like Spirit Torino headphones, the IEM is tuned like a musical instrument and is as natural as can be. This is not just some advertising slogan, but is based on the fact that classical and jazz musicians collaborated on the development to compare the real sound with that from a binaural recording. The real sound is recorded with the help of a binaural system and then reproduced with the headphones or IEM and then switched between binaural/real again and again. This listening committee, consisting of Spirit employees and musicians, carries out regular direct comparisons. So you don't just rely on pure measurements here.





The scope of delivery has surprised me directly positive. Two cables are included, one balanced with 4.4mm connector and one unbalanced with 3.5mm jack and large 6.35mm jack adapter. On the IEM side, a 2-pin connector is used, as with many manufacturers. The cables are not some cheap accessory, but high-quality OCC silver-coated cables with 392 cores. Along with the cable, a nice leather case is included for storage, as well as a cloth pouch. When designer Andrea Ricci started to develop an IEM he had to deal with many problems. The biggest thing you know is the seal. Many different ear tips change the sound significantly. On the one hand, this can be good because you can adjust the sound to your personal needs, but on the other hand, it can also falsify it greatly. After extensive testing with different ear tips, he found that he could produce the reference sound best with memory foam, since maximum isolation can be achieved by filling the ear canal. Since the geometry of the ear canal is different for each person, the IEM Twin Pulse Beryllium is delivered with different ear tips (memory foam, silicone as well as silicone double flange) in different sizes (S+M+L). In addition, there are three interchangeable filters that offer a different variation in the bass range and thus also a different isolation to cover areas such as listening in the train, on stage or at home in quieter environments. Gray stands for reference, red for an increase of +3dB in the bass and black for a decrease of -3dB in the bass. Here everyone must experiment with the different ear tips and filters and adapt to a reference sound. For example, you could take a reference recording and listen to it through headphones that are considered very neutral and then compare it with the IEM. It's a snap to change the filters, as they just screw on. I can recommend the YouTube video from Spirit Torino for the sound setup of the IEM to everyone:



Which combination sounds best to me for my scope of listening in my own listening room, more on that later.

The workmanship of the IEM is excellent for this price range around 1000€. Absolutely top notch down to the smallest detail. Despite the round shape, it sits quite comfortably in the ear, as it is also very light.





I have tested the Twin Pulse IEM Beryllium once stationary on my chain consisting of Topping D90SE and the strong Niimbus US4 as well as mobile on the terrific iBasso DX320 MAX Ti. The Pulse IEM is a bit more power hungry than my U4s and has to be set about two volume levels higher on the MAX than the U4s. In low gain, I still barely get above 11 o'clock to reach my usual listening volume.



When I first put them on, it was immediately clear to me that the Twin Pulse IEM Beryllium sounded different from my other IEMs. On the one hand, there is this airy, almost transparent openness, which I know only from open headphones. Secondly, the timbre, everything sounds so natural and real. That jazz and classical musicians with spirit engineers were at work here I can sign so, because you can also hear that. For my personal feeling I prefer the red filter (+3dB bass boost) in combination with SpiralDots. What also works well is the neutral filter in combination with Memory Foam tips. However, I like silicone better because I don't have to adjust around so much to insert them into the ear and wait until the foam has filled up. For my intended use at home, the isolation is also perfectly sufficient. Here, however, everyone must find the most suitable tips for him to achieve maximum comfort and sound.

The tonality is absolutely neutral and free of coloration. Neither a too bright nor dark timbre can be detected here. It is exactly in the middle with a minimal tendency towards brightness. When I put on my 64 Audio U4s in comparison, I first notice that something is missing in the mids and the recording contains a slight haze, which the Pulse IEM resolves directly. Now one can compare both IEMs also badly with each other, because the U4s is far from neutral and by its raised bass and treble to the goal of making the listener fun. In contrast, the Pulse IEM, trimmed to an absolutely neutral presentation without whitewashing. Of course, this leads to the fact that not so well recorded material also sounds bad. But if I put some of my references against it, then I sometimes can't get out of the amazement. Heaven on Bryan Adams / Unplugged sounds so transparent that I could put down the IEM and Bryan would just keep playing. Truly pure goosebumps. A voice reproduction that puts the U4s to shame. I can hardly get enough of Omaha by the Counting Crows or Hotel California by the Eagles, it sounds that good. Moving on to classical (Violin Concerto by Rebekka Hartmann / Out Of The Shadow) and I have to say tonally it hits the mark for me. But that is easier said than done, because for that I would have to have been present at the recording. So of course it remains only my subjective impression.

Now you might think that a neutral reproduction is dead boring. It's not! The Pulse IEM not only brings acoustic instruments and vocals within reach, but also with a musicality that you want to listen on and on.

The bass range is more subtly tuned than a U4s or Fourte Blanc. The motto here is quality over quantity! In terms of control and speed, there is nothing to complain about. The Isobaric system does its job perfectly. Even the fastest metal productions are no problem for the Pulse IEM. In the midbass range you also get enough punch, at least with the red filter. However, I wouldn't call metal music the number one genre for the Pulse IEM. If you're looking for a big visceral impact here, you'll have to reach for other IEMs, like a Legend X, U4s or Fourte Blanc. With classical music and jazz, it plays out its true strengths and this undoubtedly includes the impulsive pace paired with absolutely brilliant mids and resolution at the very highest level.

I haven't said very much about the stage so far. It is neither expansive nor too dense, but simply coherent in itself. I would compare it somewhat with the Focal Utopia 2022. Average width with very good depth staging and slick positioning as well as separation.

In the realm of IEMs, the Pulse IEM is not only an asset in the 1000€ class, but it also makes music differently than the competitors in the field and that gives it a unique selling point. For audiophiles who like to listen to jazz or classical music, I can highly recommend the Pulse IEM as an IEM that really teases everything out of a recording and reproduces it without coloration. In conclusion, it can be said that Spirit Torino has hit the jackpot with its first IEM.