Drop x Beyerdynamic DT177X Go Review and Measurements

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

  1. purr1n

    purr1n Desire for betterer is endless.

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    Last edited: Aug 29, 2020
  2. fraggler

    fraggler A Happy & Busy Life

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    I made my old Bose QC15s bluetooth this same way! Thank you for this thread. I wrote off Beyers years ago despite enjoying their looks (hello Darth Beyers) and comfort.

    Would you say these are a step up or sideways from a good T50RP mod as a daily closed/isolating headphone?

    Is this a loaner candidate?
     
  3. JellyRhino

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    https://imgur.com/6jtABfj
    0.333V and 0.003W?
     
  4. purr1n

    purr1n Desire for betterer is endless.

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    It's a sideways step. It really depends upon use case. The design intent of the DT177X was to not require an amp and be usable from a phone. The DT1770 of which this was based is 250-ohms, the DT177X is 32-ohms and more sensitive. The T50RP, especially after it is modded to so it sounds fairly flat (and let's not even mention those ultimate fail mod T50RPs, is quite insensitive and very power hungry (lower Z than Sennheisers). No way a T50RP sounds good from an ES100.

    Voltage RMS required to reach 102db SPL at 1kHz
    ------------------------------------------------------------------------
    1.828 Sennheiser HD6XX
    1.799 T50TP - Paradox with angled pads <---
    1.447 Dan Clark Audio Ether
    0.541 Focal Utopia
    0.369 Drop x Beyerdynamic DT177x
    0.217 Grado HF 2

    Hmm. This came from a member. Let me ask Drop.
     
    Last edited: Aug 29, 2020
  5. purr1n

    purr1n Desire for betterer is endless.

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    Taking a quick look at the impedance plot, the impedance at 1kHz is around 33-ohms (or 34, close enough).

    102db SPL for 0.369Vrms into 33-ohms is 0.00413 W. This using P = V^2/R

    92db is a 10db decrease, which equates to voltage loss of 0.316* where assuming everything was linear and the VC wasn't too hot, would mean it would require 0.117Vrms, which into 33-ohms would be 0.00041 W.

    *Gain in dB = 20 × log (V2 / V1)
     
  6. HotRatSalad

    HotRatSalad Friend

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    I wish they didn't have one cable going to one cup, is that the same mini xlr audeze and zmf use ?
     
  7. purr1n

    purr1n Desire for betterer is endless.

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    Same type, but obviously the pin outs will be different.
     
  8. purr1n

    purr1n Desire for betterer is endless.

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    To follow up on the DT177X with the XL Brainwavz pads. I believe Zeos liked the DT177X with these pads, "more airy" supposedly. At least that's what I was told (I cannot confirm as I don't watch YouTube videos as Google's policy is to promote longer videos. So instead of short-and-sweet, we end up with 30 minutes of random babbling which I do not have time for).

    IMG_20200902_120744.jpg

    As a mentioned earlier, the frequency response is a bit wonky. With these bigger pads, the headstage is more open and less claustrophobic as many closed headphones can be. There's a rather big bump in the midrange (which BTW I actually do not mind with most of today's pop music). The lows are shelved down. The highs are now more evident.

    Have any of you guys ever heard or even remember the Audio Technica ATH-W5000? Well, this is sort of the Beyer interpretation version of it. It's not quite right, but does have it's charms. (I've always been rather susceptible to AT weirdness). After a while of listening, I was able to acclimate to the frequency response.

    Drop x Beyer DT177X
    Frequency Response
    EARS with SBAF comp
    XL Brainwavz Pads
    upload_2020-9-2_12-9-52.png

    Drop x Beyer DT177X
    Flat Plate Coupler
    EARS with SBAF comp
    XL Brainwavz Pads
    upload_2020-9-2_12-13-35.png
     
  9. purr1n

    purr1n Desire for betterer is endless.

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    Here are the CSDs with the XL Brainwavz pads. I was curious to know how I could acclimate to the bump in the 8-10kHz region. I was suspecting very little ringing (no long lived sharp ridges) at the bump which turned out to be true. There are two small ridges (8kHz and 9kHz) but they are very low in amplitude (dark blue) and end before 0.9ms.

    There is ringing at 4kHz, but I've noticed for years now that I can be pretty deaf to ridges between 4-5kHz, or maybe I like the edge and incisiveness that such imparts.

    FPC DT177X Brainwavz L.jpg
    FPC DT177X Brainwavz R.jpg
     
  10. Hrodulf

    Hrodulf Prohibited from acting as an MOT until year 2050

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    Not too crazy about that impedance graph. That 6-7kHz resonant peak shouldn't be there. Decent headphones only have the Fs peak and maybe a rise in the higher frequencies due to inductance.
     
  11. purr1n

    purr1n Desire for betterer is endless.

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    The impedance was taken on L channel, which coincides with a dip. Could be something acoustical. As you know, a bass port will also create a impedance bump at its tuning frequency. This could be something similar except it's a null.
     
  12. E_Schaaf

    E_Schaaf MOT: E.T.A Headphones

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    The solid lambskin version of those same pads should bring back the bass and stay similar in the middle mids on up. Perforated pads always suck out the lower mids on down with closed headphones IME. I can mail you a pair of solid XL pads and another pair or two of aliexpress pads if you'd like to measure / will be keeping that pair for a bit. I've got about 20 different pad types that didn't work out with my Fostexes but might help on these.
     
  13. purr1n

    purr1n Desire for betterer is endless.

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    Sure. Send them over! That would give them a Beyer take on the X00 sound. :p

    @CEE TEE: Can I hold on to these just a bit longer?
     
  14. Melvillian

    Melvillian Friend

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    That type font on the cups reminds me of Batman for some reason. I ordered these yesterday after Marv’s impressions and then got an email at night saying they’re delayed until October.

    Do these have that super comfortable and light but solid feel of most Beyers?
     
  15. Hrodulf

    Hrodulf Prohibited from acting as an MOT until year 2050

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    This also is reflected in the HD measurements. Within the null distortion rises as the fundamental dies down and only harmonic overtones are registered. Sometimes severe membrane breakups also cause these impedance blips.
     
  16. SSL

    SSL Friend

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    Pretty much every Beyer using this basic cup design has something going on in this area - increased distortion combined with nulls in the FR that turn out to be resonances in the CSD. DT880 seems to have been the most immune due to using the most damping material in the cup and around the driver.
     
  17. CEE TEE

    CEE TEE MOT: NITSCH

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    Yes!!
     
  18. CEE TEE

    CEE TEE MOT: NITSCH

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    The font looks nice with more spacing...I see the
    B A T M A N B E G I N S thing. With more narrow spacing, it looked a bit like when someone’s eyes are too close together.

    The letters are actual burnishing through the paint into the aluminum cups. :)

    Yes, lightweight and comfy but well-built. I dig them for lying down with and moving about the house doing chores with the ES100 attached. The additional weight still does not make them too heavy, despite the seemingly big size.
     
  19. YMO

    YMO Chief Fun Officer

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    Did they said what date/time in Oct? I'm closing my Amex credit card accounts shortly, still have Amex MR points to burn via PayPal.
     
  20. JellyRhino

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    They are probably more comfortable than my Focal Spirit Pros ;), but they look kind of v-shaped with the lambskin pads. The Spirit Pros are pretty good soundwise for closed backs, neutralish and engaging enough. Also, they don't sound boxy or incoherent. How do they compare? What about resolve ability and technicalities?
     

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