I made a hyper-engaging headphone with HD800S drivers

Discussion in 'Modifications and Tweaks' started by Bill-P, Mar 1, 2020.

  1. Bill-P

    Bill-P Level 42 Mad Wizard

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    Sorry, long time no update. I got pretty busy and I'm preparing for a trip overseas (and also I'm leaving this weekend!).

    But here's a quick update:

    1. I finally had time to completely retweak the housing shells for what I find to be the "best" compromise in terms of distance/soundstage/frequency response, etc... (I tried somewhere between 15-20 different variations since the last shell design)
    2. Being that I'll be overseas for 1.5 months without any way to print and send out the new shells to others to try, I'm going to upload the .stl files now. Please check top of first post!
    3. Yep, that's right, I'm making the files available so everyone can print their own shells and play with them! I can start printing again and send the shells over to friends whenever I get back. Will still send out some shells for friends that have been waiting for me. I do apologize for the lateness!

    Didn't have much time to design a better pair of grilles... (nor will I have time to send them out), so also uploading the best ones I have right now.

    And here's obligatory frequency response measurement with the new shells:
    [​IMG]

    Won't take much to get to this with the new shells. I got this with just the middle layer of medical face mask and the Brainwavz Hybrid pads.
     
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    Last edited: Mar 1, 2022
  2. spoony

    spoony Spooky

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    Very considerate providing the STL files for everyone, kudos!
     
  3. spoony

    spoony Spooky

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    BTW, here's a piece of uninvited feedback:

    Screenshot 2022-03-01 151423.png

    Consider converting this curved fillet into a 45-degree chamfer (even though the capsule could get taller and you'd have to adjust the headband yoke holes to accommodate the extra height while preserving the distance to ear.) This will allow for support-less printing in pretty much every FDM machine out there.
     
  4. Bill-P

    Bill-P Level 42 Mad Wizard

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    Oh, by the way, I can print the whole capsule out just fine without any support, but you are right. Without the right settings, it can cause some weird issues with some FDM printers.

    I'll fix this section at some point when I have more time.
     
  5. spoony

    spoony Spooky

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    Yeah, looks doable with decent part cooling, but baseline models seldom have this. Thanks for considering!
     
  6. gixxerwimp

    gixxerwimp Professional tricycle rider

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    Just to clarify, these "retweaked" capsules are different from the ones you recently sent out? What did you change?

    Does your existing grill design fit the capsules you previously sent out? Please notify when you've uploaded it. Thanks!
     
  7. Hands

    Hands Overzealous Auto Flusher - Measurbator

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    I realized my last, posted attempt at tuning these was shit. I probably got too engrossed in the rapid, iterative tuning process, didn't do enough A/B comparisons with other references, and/or was going through a period of extra bad hearing.

    But I'm playing with a different config I'd like to share. While I'm still fiddling with it, I've been more diligent about keeping my hearing and thoughts in check. Maybe.

    This tuning will get you something more akin to the bassier, warmer ZMFs or the Paradox Slant. They are definitely bassy, hit surprisingly hard, have a moderate amount of bass/mid bloom, but have a fairly balanced upper-mid and treble response. If you're looking for a more neutral sound, look elsewhere.


    Tuning:

    1. Two layers of 3M micropore tape over the front baffle. If you get the 3" wide stuff, this is super easy. Get two long pieces, make them taut and lay them over the baffle, press into place, gently cut around the baffle edges and driver opening perimeter, and peel away the excess.


    2. MrSpeakers/Dan Clark Audio Alpha Dog pads. Yeah, remember these things? Looks like he still has them for sale. These are great pads to keep around for a variety of projects. I'm glad to see them still available!


    3. On the driver's back side, cover all the exposed metal mesh areas except the center vent with a single layer of 3M micropore tape. You'll want full coverage, sealing against all plastic edges.

    A lazy way to do this (i.e. my way) is to get a large piece of micropore tape, loosely drape it over the back of the driver, press it into place by working your way from the center out, and then cut out an opening in the middle for the center vent.

    However, you will need to play around with the micropore tape coverage on the central mesh sections with the little holes. I say this because I ripped the metal mesh out of the central "ring" entirely and ended up replacing it with that single layer of micropore tape. This is a huge PITA and not something I recommend.


    4. Misc tips: Make sure you aren't blocking the center vent in the driver from either side. Make sure the driver has a good seal with the enclosure/baffle. No need for extra material directly in from of the driver. Seal off any of those little holes around the baffle's driver perimeter ring initially and open to taste (similar for adding/reducing front battle micropore tape).


    That's it.
     
  8. gixxerwimp

    gixxerwimp Professional tricycle rider

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    I got the ZMF HD6xx pads in. Quick impressions compared to my mashed out, heavily angled HD650 pads:
    • perf suede: Pretty balanced overall, with significantly more forward (but not shouty) mids, that could be easily reduced with EQ. Surprisingly, sound drier even with more reflective leather surface than Senn velour.
    • perf leather: Don't have forward mids of the perf suede. Very similar tonal balance to my modded stock pads. Provides more percussive/tactile bass than Senn velour (as do the suede, but these even more so).
    They're quite small and barely fit on @Bill-P's shells. It's fine if you handle them gently, but they could easily be pulled off if you handle them like regular headphones. Overall, a good pairing with BP800.
    Hmm ... @Bill-P seems to have disappeared again :drunk:
     
  9. frank2908

    frank2908 Rando

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    What earpads do you use on these?
     
  10. CEE TEE

    CEE TEE MOT: NITSCH

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    ^My favorite version of Bill's 800 = Sennheiser Orpheus HE90 pads...and he bought 2 pairs so he could make one matching L/R pair. Not cheap, this.
     
  11. Hands

    Hands Overzealous Auto Flusher - Measurbator

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    I still chip away at these from time to time. It has been a real pain in the ass to try to squash the ~6KHz peak the HD800 driver tends to exhibit. The drivers are very sensitive to positioning, of course, and I believe that peak has a tendency to get worse as you increase distance between the driver and your ears. Angle may or may not make it worse.

    Last night, I was playing around with a variety of front damping materials and configurations when I gave this a shot:

    https://shop.zmfheadphones.com/collections/diy/products/acoustic-titan-mesh

    I have the radial vented variant. I still need to use additional damping to get the sound where I want, so the non-vented mesh might be even better...or it might be overkill. Not sure.

    I put the mesh over the baffle rather than direct over the driver, which is recessed a few millimeters from the front of the baffle. I lined up the center opening of the mesh with the center vent on the driver.

    This mesh has by far done the best job of removing that resonance point without taking a shit all over the rest of the upper-mids and treble.

    Worth checking out that ZMF titan mesh if you're dabbling with these HD800 mods. Hell, maybe it could prove useful with the stock enclosure...
     
  12. gixxerwimp

    gixxerwimp Professional tricycle rider

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    Interesting ... with my modded HD800s, I still need a narrow -5dB cut at 6kHz to "neutralize" them. But with my BP800s, I actually have a broad +1.5dB bump at 4kHz. I've had none of the HD800 face tweeter issues with Bill's capsules and a the Faraday cloth as baffle material.
     
  13. Walderstorn

    Walderstorn Friend

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    @zach915m had hinted, a long time ago, about maybe providing these for the hd800s but then i think it became sidetracked.
    I would like to try it myself.

    Have you tried solderdudes extension cord/plug passive filter?
     

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