I just got a pair of the new DT770 Pro X headphones and here's a quick summary until measurements are done. I purchased this preview version myself, so no conflict of interest if you buy one or not. More photos attached to the post, so it doesn't clutter things up. I've had every Beyerdynamic model for my business, so have a good perspective having had the chance to use over 300 different headphones and IEMs. Lacking test equipment, I'll give lots of comparisons to popular models. In a nutshell, these sound the most like the Truthear Zero Red but with 2db-3db recessed mids around 600hz and a fairly aggressive treble climb up to where snare drums hit and female vocalists go into higher ranges. Vocals and acoustic instruments like violins don't have the same lush/full sound like they do on the Truthear Zero Blue version, Sennheiser HD600/650, or Thieaudio Ghost, which is as nice as the Sennheiser HD650/6XX at a much better price.

To test them, I used:
SMSL DO400
Topping D10b + SMSL Drop HO150x
Moto G Power phone with and without Apple 3.5mm to USB adapter
16 bit 44.1khz FLAC
Destiny 2
I test everything in it since the sounds are so familiar after years of playing, and just keep a solo player clan for getting engrams each week.
Fightmare#2666 Club Engram Clan ID: 6424964

The Moto G Power did get them loud enough at max volume, but they sounded really good as long as you don't need headroom to equalize or party level volumes. With the Apple adapter it was unlimited volume and sounded terrific with FLAC files. On the DO400 and the temporary stack I pulled out they got better, but not night and day better. These really can do well with less power as long as your source files are good (i.e. lossless). I just ran in Windows exclusive mode for each test on the PC. My advice is just get a $9 Apple adapter on these. You won't need more power than that, even if you equalize with a preamp reduction. The main worry is their power handling is 210mw which is 1/5th of it's older brothers, so be really careful not to leave an amplifier in high gain mode or they might go up in a puff of smoke.

Imaging is excellent on these, as good as the Sennheiser IE600, in Destiny 2 I could instantly identify an enemy behind me. If anyone asks for a closed back gaming headphone, this is my new recommendation. Soundstage is on the money, not fake big or too small, just like the DT770 or MMX300. The only downside for gaming is the dip in the male vocal range is where footsteps can happen also, so a 3db boost at 600hz might be needed if you yearn to hear the pitter patter of little enemy feet in all situations.

For music, the bass is present and extends way down, but doesn't bleed into the mids or sound overly boosted. It's there if the song calls for it, but the DT770 250 ohm still pounds with more authority than these do in the bass department. For those bass obsessed, just get the Artti T10 and you'll be bouncing in your chair to hip hop songs. These aren't going to make you vibrate out of your chair like a hovercraft from the bass response.

Mids are a mixed bag. Male vocals are recessed and somewhat distant, with a hollow sound at times, not sure if it's the ear cup resonance or the kind of pre/post ringing in the 32 ohm DT770 with those drivers. It'll take measurements by someone with the equipment to analyze it. On the DT770 250 ohm it's not present though. Female vocals are good except when singers like Ellie Goulding or Sia go into their higher ranges and then it's higher/louder than they usually sound. It's not shouty or sibilant, but on the edge of too bright/thin at times. Amy Lee from Evanescence and Adele weren't as affected. If you value vocals and stringed instruments like violin, cello, etc. you'll be a lot happier with the Thieaudio Ghost for less money, or the Sennheiser HD650/600 for more (or used for the same price).

Treble: It's a Beyerdynamic, but it's not the dread peak like the DT990 600ohm I keep around for testing. It's a little bright, but the sound is the climb from mids to treble seems pretty aggressive. Songs with a lot of snare drums get annoying, I'd bet that where it peaks. The rest is detailed and sounds good, and higher treble isn't absent of air, but its not emphasized either. I think they played it fairly safe with the tuning.

Overall, it's better than the MMX300, DT700 Pro X, and 32 ohm DT770 but not as much fun as the DT900 Pro X. For closed back headphones I'd recommend them for a gamer who likes music and just wants one pair. For music fans, it's really if your library isn't focused on vocals and acoustic instruments. The drivers are fast and for EDM or rock it's very good. These are not going to fit every genre of music though. The Thieaudio Ghost is better for music, just not as good for gaming. I have a Sennheiser HD650 and it's still kingpin for acoustic and vocals along with the HD600.

They fit the same as other models, pads are the same traditional velour from the original DT770. The shells seem a little thinner plastic if you tap on them. They still feel solid with the same slider adjustment but it feels smoother and less clicky. The cable is the 9ft mini XLR, but a shorter one for travel would have been a good idea. These are compatible with the other 3 pin mini XLR cables.

The published specs:
impedance 48 ohms
weight headphones without cable 305 g
Headphone frequency response 5 - 40.000 Hz
STELLAR.45 driver
Sound pressure level @ 1 mW/500 Hz 98 dB
Sound pressure level @ 1 V/500 Hz 112 dB
T.H.D. @ 500 Hz < 0.05 %
Maximum short-term power handling capacity 210 mW
Ambient noise isolation 16 dBA
Length and type of cable 3 m / straight cable detachable, single-sided

I'm going to stick with my Hifiman HE5xx for a daily driver, but it was really nice to have a new favorite closed back pair to recommend to casual or serious gamers. For specific music that's not vocal or acoustic focused it would be fine. The DT177x would be better for most music though if closed back is the requirement. Noise isolation was as good at the DT770, which will block a central AC sound or a computer fan, but not much more like a landscaping crew rolling past. Overall, they're excellent for gaming, but for music they require equalizing, most won't be happy with them out of the box. They have good potential though if you don't mind tuning them with EQ.

I just got the Drop SMSL HO150x this week, and have a ton of others to compare it to. It's basically an SMSL SP200 but with a quiet noise floor and smoother volume wheel. It doesn't get hot (lukewarm at best) and sounds flawless with lots of power and simple controls. I've got an SMSL C200 and DL200 as a DAC for testing, and the quality on the HO150x is noticeably better sounding than the onboard amplifier on either combo unit. I test for channel matching, and even though that varies per unit, this one is within .5db in high gain and tightens up after 30 percent volume. In low and medium gain matching is exceptional, within .1-.2db which is up there with the best analog amplifiers (my Topping A90's are always within .1db up to 20 percent then match by comparison).



The best part is the noise floor, really quiet in low gain for IEMs which the SP200 wasn't good for (on ASR it did lousy in the 50mv test). They really fixed all the issues and I'd be happy to use this every day. There's a DO400 combo here also I've been using all week, and could not tell the difference between them. The one downside is the size, it's wide and not that long, so plan your DAC choice so it has something to sit on in a stable way. If you have room to run side by side, the Topping D10b I have sits happily next to it (and the display matches the power button orange). This combo really adds up for me personally, since it has no MQA, remote, or Bluetooth antenna, just simplicity. If you've heard the JDS Atom, Magni Heresy, Drop THX One, or Topping L50 then you know what it sounds like already. It's complete transparency and a silent noise floor with nothing to get in the way.

I'm in low gain on the Hifiman HE5xx and can go as loud as I feel safe, and medium gain only if I'm equalizing with a preamp reduction. Most people aren't going to use high gain on this and get the best performance in medium. I might just keep the SMSL DL200 and sit this on top of it since it would cover all the different connectors. I'll over to send it to ASR to see if Asmirm wants to do measurements on this unit. I'm really confident this will do great under testing. If it's got the connections you need, then go for it. The same power on both headphone jacks, and I just use a Youkamoo 4.4mm to XLR adapter I had anyway if needed.

If you already have a 120 SINAD scoring amplifier, don't expect anything different. If you like the SP200 but the noise floor was too loud or scratchy volume wheel, you're going to love this because it's the "fixed" version with none of the problems of the SP200. The competition in this price range is the Topping L50, JDS Atom 2, and Schiit Magnius, both in price and performance. Without considering price, what is a clear upgrade? I have a Topping A70Pro and with the D70Pro Octo it's audibly better at a cost. The SMSL SP400/M400 combo I've got it also clearly superior. Short of those, even the Topping A90 or A90D Ive got isn't a clear upgrade from an audible perspective. In a blind, volume matched test I wouldn't be able to tell which it was vs. the A90's.
Grab one and sit an SMSL D-6s 5 volt DAC next to it and never regret it. Even a Topping D10b is transparent, and no remotes to keep track of or manuals to read. This one is in my category of equipment I'd recommend to anyone if it's got the connectivity you need. I had an SP200 for years and this has every shortcoming it had fixed while retaining all of it's power. It proves you don't need a remote control and IPS display to get top tier performance without melting down a credit card.

Just got the 4.4mm version of these in. Tested on an SMSL DL200 DAC and Topping A90 amplifier. These are a fun planar really best for hiphop, EDM, or happy teen music. It's not for critical listening or production work. I bought these with my own money and at about $69 and a $10 off coupon, they're a good value for a planar, just not as competitive as the 7hz Salnotes Zero:2 I got at the same time. Those really set a new bar of price and performance for IEMs. My usual daily driver is a Simgot EA500 with black nozzles. Listening to them now without equalizing, they aren't the most detailed set, comparable to the Hifiman HE4xx. It's fun though, the bass has some authority, the 8khz treble peak can be hear, mids like male vocals sound a little recessed but not bad. Upper male vocals and acoustic guitar just don't sound realistic though, which is the main reason I wouldn't use them. For gaming, a low shelf filter took the bass below 150hz down, and imaging was pretty good. Also the soundstage has some width to it, but average depth. They really do sound like they chart below, including the rapid treble rolloff which deprives them of any airy feeling. Cymbals and high hats sound muted, not much sparkle.



The cable is very high quality, and stock tips were fine (which measure 5.7mm outside dimension on the nozzle). For $60 on sale I'd say they're worth they money if it wasn't for the 7hz Salnotes Zero:2, which for $24 runs circles around them. For the same price range, the Simgot EA500 is built so much better, and the red and black nozzles give flexibility for tuning. The Moondrop Chu II is just as fun in the bass department, and so much less expensive.


Overall the listening experience is pretty good, but below and above this price is better. If you really want the planar sound, then it's a good option. The KZ PR3 is very close to them, so if you have those, these will just be a sidegrade. I wouldn't use them every day, and would recommend to a friend they go with the 7hz Salnotes Zero:2 or wait for a sale or coupon because I just got the Letshoer S12 Pro for $91 on Aliexpress and they're much better for only a little more. The $25 segment has gotten so good, it's really worth skipping this price point and aim for $90+ instead. If you just have $50-$60 burning a hole in your pocket or gift card, the 7hz Salnotes Zero:2 and an Apple USB to 3.5mm adapter would a lot more fun. I use a pair of them, and my Hifiman HE5xx for daily use. Spend more or spend less than the $60 price point on IEM's, it just isn't a good segment to shop these days.

Good about them:
Non slip coating looks utilitarian, but these aren't going to slip out of your fingers.
Cable is really nice, I wish all IEMs came with this cable, sturdy and tangle free.
They do take well to equalizing if you have extra power for a preamp reduction.

Dealbreakers:
Treble rolloff takes air and sparkle out of listening. Heavy metal tracks sound flat and dull.
Bass too much for gaming, explosions are annoying.
Mids recessed, too few tracks where these shine.

I bought these personally for $30 on Aliexpress during the 11/11 sale, so no financial interest if/where you buy them or not. Testing was done with the SMSL DL200 using stock cable and Sonicfoam tips. Some people can write "Moby Dick" but I have the attention span to write "French Military Victories of the 20th Century" so I'll keep it brief with lots of real world comparisons. I have an audio equipment business, so I've heard a ton of what's out there (including the PR1 and PR2) to compare it to.

The Basics: They come in a simple box with a small set of tips, and packed with the foam ones for protection. The cable is firm and coating is a little grippy but not microphonic. I replaced it with a multi kit from Aliexpress that has the 3.5/2.5/4.4 balanced plugs, but tested with the stock for this review. This set is very tip sensitive and the ones that did best had a firm sidewall like the Dunu S&S and the Sonicfoam. The nozzle measures 4.9mm exterior on the barrel, so most tips will fit these if you have some already.

Powah! I use a Hifiman HE5xx for a daily driver since they're comfortable and versatile. The volume wheel in low gain on the SMSL DL200 is nearly in the same place with these. A phone or onboard sound likely won't have enough current. An Apple USB/3.5mm adapter should be considered the minimum. Balanced will have more current, and possibly a lower noise floor depending on source.

The Sound: They really do sound like the frequency chart at the top post. I equalized up the 400hz-600hz range by 2.5db and brought down the 2.5khz slider by 3db and it got them to the neutral profile I personally prefer. Out of the box, the 2.5khz peak is too edgy, and mids just a little flat sounding for vocals. Any music player can make simple adjustments like these, no need to install something else over it.

All songs are clickable on my YouTube Music playlist, to avoid filling the screen with album cover artwork. I just ran through them to get an overall impression.

Summer Love by 1da Banton
Regardless by Raye
Rhythym Is A Dance by Snap!
Hypnotize from Notorious B.I.G.
Get Low by Lil Jon
Leaving Wallbrook by Hans Zimmer
Vogue by Madonna
Time and Tide by Basia
Big Girls by Sia
Hi-Lo and Breathe No More by Evanesence
.45 by Shinedown
Dancing with a stranger by Sam Smith
Cry For Help by Rick Astley
Heathens by 21 Pilots
Cafe Mocha by Jesse Cook
Sign Your Name by Terence Trent D'Arby
Yah Mo B There by James Ingram & Micheal McDonald
Always With Me, Always With You by Joe Satriani

I ran them through a good variety of songs to get a good picture. Vocals fill out with EQ otherwise they sound a little thin out of the box. A little bump makes a big difference. Everything sounds accurate and the soundstage and layering can sound really good with the right tracks. The important thing is the shortcomings are easy fixes. I paid $30 with shipping for these, so it feels like I stole them.

Comparison: I have currently:
Moondrop Kato is tuned better out of the box, but to me isn't worth any more with a little EQ correction. Soundstage and imaging are not that far apart.
Simgot EA500 Has a smaller soundstage but much better noise isolation. Black nozzles and Dunu S&S tips help make it more expansive, and the cost of some mid range resolution due to the longer length of those tips.
Hifiman He5xx with EQ they really do sound a lot like my daily drivers. About the same effort to drive. The HE5xx is great for me out of the box though, never needed to change them up.
7hz Timeless AE with the long length tips they sound better, but they aren't mind blowing for the difference in price. There's a dynamic driver in with these, and it's just not a mix I like for bass response. Same with the Blessing 3 I just had in, yes they're technically superior, but a horrible value.
Seeaudio Yume II These also have recessed mids, but corrected for music they're great as well. For gaming these are epic because of the soundstage depth as well as width. You can hear enemies from the same distance in front of you as many top open back headphones. I think these and the Moondrop Starfield are the winners if you're going to play music and throw into FPS game without switching IEMs at their price points.

Overall even at $50 they're worth it, and easily compare to $90 IEM's I've got or had recently. Factor in tips if you don't have them, and if you have a balanced source you'll want to probably upgrade the cable also. They have the planar magnetic sound, without the weight or steep amping requirements some older, less sensitive models have. I'd certainly take these over a Hifiman HE-560 or Sundara to use every day. They aren't perfect out of the box, but take very little effort to get much better.