Drop x Beyerdynamic DT177X Go Review and Measurements

Discussion in 'Headphones' started by purr1n, Aug 28, 2020.

  1. purr1n

    purr1n Finding his inner redneck

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    https://drop.com/buy/massdrop-x-beyerdynamic-dt177x-go-headphones

    I know that any mention of Beyer and Tesla (not the car, but Beyer's motor tech) will elicit groans or painful shrieks from most of the members here, but I assure you guys this is not the case with the DT177X. Someone at Drop worked their magic custom tuning on this one for sure. We shouldn't expect Sennheiser type tuning, but we have here is sort of like Beyer trying to be ZMF! The timbre is definitely Beyer, but the tonal balance voluminous in the lows with dip in the 2-5kHz region, with a slight uptick after that. Nothing close to the DT990-250 in the highs - good grief - in fact far from it.

    DT177X.jpg

    Did I mention that the headphone is gorgeous? I don't think photos do it justice. It's got a nice aluminum cap with the letters DT 177X GO stylishly printed on them. The "Made in Germany" in small print at the bottom is a nice touch! As far as style and layout, it's absolutely perfect. Well, maybe it lacks a final touch, like DROP in big ginormous lettering below the DT 177X GO? I kid, I kid!

    The DT177X comes with two sets of earpads. A velour and a lambskin. Most of the measurements I will provide will be with the lambskin pads. I will also provide a set of measurements from the Brainwavz XL perforated pads, which may not be to everyone's taste (Zeos likes them and I do).
    IMG_20200828_151440.jpg

    One thing to note is that the velour pads are a bit of pain to install. The trick is to use the notch guide to feed the outside flap of the velour pads into the groove. Be sure to press on the pad to keep it parallel to the baffle. If you are looking at the notch at this angle, then you are probably doing it wrong. Note that the other pads do not require this procedure. The outside flaps can easily be slipped over the lip of the cup.
    IMG_20200828_102204 (2).jpg


    The DT177X uses a four-pin connector. It's understanding that this makes it possible to do a balanced connector. The provided cable is nice. Not skinny and wimpy, but also not outrageously thick and inflexible (I'm looking at you Focal). It feels "pro", and that's a good thing. I can run it over with the wheels on my chair and not be worried they will break. Yet at the same time, they are flexible while being immune to twisting and tangling.
    IMG_20200828_152034.jpg
     
    Last edited: Aug 28, 2020
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  2. purr1n

    purr1n Finding his inner redneck

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    Drop x Beyerdynamic DT1770X Go
    Lambskin Pads
    Frequency Response
    miniDSP EARS with SBAF calibration
    upload_2020-8-28_15-26-47.png

    See, I told ya guys! It ain't bad. A bit V-shaped consumer tuning. There's a rise in the lower to upper highs, but the level of this rise is on par with the lower mids and below the bass. Let's do a reality check with FR measurements utilizing other methods.

    Drop x Beyerdynamic DT1770X Go
    Lambskin Pads
    Frequency Response
    Flat Plate (no ear) Coupler (Compensated)
    upload_2020-8-28_15-30-37.png

    Note the 6kHz dip is a measurement artifact. Confirmed in the CSDs below: https://www.superbestaudiofriends.o...-go-review-and-measurements.9820/#post-315904

    This next one is from the foam coupler that attempts to some extent to simulate a free air measurement. There could be some advantages to gaining some insights into the nature of the higher frequencies as this measurement will be somewhat isolated from ear and head reflections. This also shows us how sensitive the bass frequencies are to seal since these measurements are in effect without a seal. Some headphones such as orthos that depend upon a seal will be less damped and show higher peaks that would not otherwise be there if the headphones were worn.

    Note that the bass response in the "FAC" measurements below is not accurate. The DT177X, like many other closed headphones, seems to require a seal for proper bass levels. Among all three measurements, in this case, I feel the miniDSP EARS with the calibration most closely aligns with what I am hearing. Those who have experienced this headphone feel free to chime in.

    Drop x Beyerdynamic DT1770X Go
    Lambskin Pads
    Frequency Response
    Foam Coupler (Free Air Sim)
    upload_2020-8-28_15-34-32.png
     
    Last edited: Aug 28, 2020
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  3. YMO

    YMO it's not drinking alone if you're on Zoom

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    @Donald North did you pre-order this yet? Would be cool to get some inputs from old-school Beyer users like yourself. Maybe I might be drunk enough and do a blind buy of this one day.
     
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  4. Dzerh

    Dzerh Friend

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    when announcing these cans massdrop actually promised to offer balanced cable in some future. This future is yet to come (except I missed some announcement)
     
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  5. Dzerh

    Dzerh Friend

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    And at least with SW51+ I like velour pads more, sheepskins sounds muddier for me.
     
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  6. purr1n

    purr1n Finding his inner redneck

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    I didn't think the DT177X scaled as much as the 250-ohm and 600-ohm Beyers. I tried on my better amps and setups. However, it sounded fantastic from the Motu Ultralite. I actually preferred it slightly more form the Ultralite as its headouts are a overall warmer sounding than from my 45 tube amp. Here is the impedance curve. Nominal impedance is 32-ohms.

    Drop x Beyerdynamic DT177X Go
    Impedance Curve
    YEL = Free Air
    GRN = On Head
    upload_2020-8-28_15-55-5.png

    I'll give it a shot from a portable source and report back. I will provide sensitivity figures vs other headphones.

    Keep in mind these are closed cans. This is stuff I would use for working when I wanted to tune everyone out, even plugging into a phone, portable, computer, audio dongle like iFi iDSD Nano BL, Fulla 3, etc. The DT177X is easy to drive, doesn't sound bad with an enjoyable minor V-shaped response, and seals rather well. These tick a lot of boxes. The XL Brainwavz pads are a trip and take some getting used to. Sometimes I like oddball stuff. Will explain in later post.
     
    Last edited: Aug 28, 2020
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  7. purr1n

    purr1n Finding his inner redneck

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    The Velour sounded muddier to me while at the same time having more mid-treble. This is why I didn't take any more velour pad measurements other than this one. There is strong consistency between EARS and FPC here, so we can infer how things will look like on the miniDSP ears. Also note that the distortion characteristics, not shown, are the same regardless of the pads.

    Drop x Beyerdynamic DT177X Go
    Frequency Response - Y-axis compressed to better highlight differences
    FPC Compensated
    GRN = Lambskin pads
    CYN = Velour pads
    upload_2020-8-28_16-4-34.png

    Velour pads have slightly more elevated bass and deeper dip in the upper mids probably. Here's another way at looking at it, shifting the Lambskin measurement down 2db.

    Drop x Beyerdynamic DT177X Go
    Frequency Response - Y-axis compressed to better highlight differences
    FPC Compensated
    GRN = Lambskin pads
    CYN = Velour pads
    upload_2020-8-28_16-10-18.png
     
    Last edited: Aug 29, 2020
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  8. Vtory

    Vtory Illogical Spock

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    I've first known Marv many years ago through his harsh criticisms toward Beyer flag ship teslas with csd measurements (CS era I recall). In 2020, I am looking at this thread.. Good to see (part of) the world is changing in the right direction -- on both manufacturing and consuming sides.
     
  9. zerodeefex

    zerodeefex Grumpiest admin

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    Sooo, basically another proof point that Drop was amazing with @CEE TEE. Too bad their efforts without him are lacking to be generous.
     
  10. purr1n

    purr1n Finding his inner redneck

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    Drop x Beyerdynamic DT177X Go
    Lambskin Pads
    CSDs
    FPC
    FPC DT177X Lambskin  L.jpg
    FPC DT177X Lambskin  R.jpg

    Drop x Beyerdynamic DT177X Go
    Velour Pads
    CSDs
    FPC
    FPC DT177X Velour L.jpg
    FPC DT177X Velour R.jpg
     
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  11. purr1n

    purr1n Finding his inner redneck

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    For a better comparison to "back in the day" to Beyerdynamic T1. Below are apples-to-apples using the original V1 or FAC type measurements. Drop has gone a great job tuning them. Beyerdynamic Tesla series headphones can be known for having very sharp and sizzly highs. Not so here.

    Drop DT177X
    CSD
    FAC
    FAC DT1770 Lamb  L.jpg
    FAC DT1770 Lamb  R.jpg

    Here is the OG Beyer T1

    Beyerdynamic T1
    CSD
    FAC or Changstar "V1"
    [​IMG]
    [​IMG]

    Note how the CSD measurements back then extended to 5ms, much longer than the current sets where I stop at 3ms to really zoom in on any ringing.
     
    Last edited: Aug 28, 2020
  12. SSL

    SSL Friend

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    Imagine if Beyer manages to bring this tuning to the imminent T1/T5 3rd gen. One can dream.
     
  13. Pogo

    Pogo Friend

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    Anyone spent any time with the Amiron Home?
    Beyer is already there with combining Tesla drivers with "audiophile" tuning.
     
  14. purr1n

    purr1n Finding his inner redneck

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  15. wadec22

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    Not sure if you saw my impression thread, but I agree with a lot of your assessment.

    I'm with @Dzerh though, I preferred the velour pads. Sheepskin pads sounded too muffled in the treble for my tastes.

    Really too bad @CEE TEE wasn't at Drop long enough to help them fix the 1990 as well.

    Thanks for taking the time @purr1n.
     
  16. rhythmdevils

    rhythmdevils Best SBAF member of all time

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    I wanna have sex with those CSDs. Is this a Beyer (other than DT250 250ohm) I might at least not mind? Wow. Go @CEE TEE
     
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  17. purr1n

    purr1n Finding his inner redneck

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    Last set of measurements (almost)

    DT177X
    Distortion (Traditional)
    DT177X L HD.jpg
    DT177X R HD.jpg

    DT177X
    Distortion (Alt)
    DT177X L HD Alt.jpg
    DT177X R HD Alt.jpg

    DT177X
    Attack and Decay Envelope of 10 Cycle Burst
    B1696 DT177X-2.wav_burst.jpg
     
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  18. YMO

    YMO it's not drinking alone if you're on Zoom

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    Seems the tuning is good for casual listening/pop stuff. I did made a post before that I want a Closed Back for some rap and electronic stuff, but I don't want too hard hitting bass. This doesn't seem it will hit that hard, could be good for me.
     
  19. zerodeefex

    zerodeefex Grumpiest admin

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    @purr1n how well does it seal? Curious because I'm thinking of doing a purge and picking up a few specific use items. This looks like a good closed general use HP. strap a shorty balanced cable to it with an ES100 or UP4 and it will probably beat out the mainstream BT options quite a bit.


    I use the HP3 at work for a lot of hip hop (well I did before we went fully remote) and, with the Loki, it absolutely works well.
     
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  20. purr1n

    purr1n Finding his inner redneck

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    There's a bass lift, but it isn't overemphasized. The lows sound flatter than say a ZMF Verite Closed and are nothing like the Heritage HP-3 or TH900 bass, where the bass is ginormous.

    --

    Here are some sensitivity figures. Note that my rig registers louder (higher SPL) or a given voltage compared to Tyll's rig.

    Voltage RMS required to reach 102db SPL at 1kHz
    ------------------------------------------------------------------------
    1.828 Sennheiser HD6XX
    1.447 Dan Clark Audio Ether
    0.541 Focal Utopia
    0.369 Drop x Beyerdynamic DT177x <--
    0.217 Grado HF 3

    Yeah, this will work fine from my computer outputs or iDuodenum XD-05+. At 32-ohms, it will ask for some current, that is more power will be required than something with higher impedance - but the thing is so darn efficient, like Grados, that we are talking about 4mW or 0.004W to reach 102db at 1kHz.

    Bonus points to whomever can calculate voltage and power to get 92db SPL at 1kHz using the above info. LOL, this should be the test for new members to register.
     
    Last edited: Sep 21, 2020 at 11:40 AM
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