HD650 KISS mod

Discussion in 'Modifications and Tweaks' started by purr1n, Dec 6, 2016.

  1. zonto

    zonto Friend

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    https://www.secondskinaudio.com/accessories/sample-pack. KISS mod even mentioned in the reviews. ;)
     
  2. Gizmo1k

    Gizmo1k Rando

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  3. JayC

    JayC Resident Crash Test Dummy

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    EU gang - where do you end up getting Dynamite extreme/damplifier pro and the Creatology foam from? I don't see any convenient trial packs or so available on our side of the world..
     
    Last edited: Dec 21, 2020
  4. Syzygy

    Syzygy Friend

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    In north Texas, I walked into the auto department at Best Buy and offered to buy a small sheet. They gave me a scrap piece big enough to do 2 mods with for free.
     
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  5. señorhifi

    señorhifi Acquaintance

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    So I can't describe how awesome I think this mod is! It literally made me like my HD650 so much, that I don't care anymore for any other mid-fi gear (in fact I don't even care for the summit-fi stuff, due to the often irregular FR either). Great stuff, thanks Marv for the instructions :)
     
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  6. señorhifi

    señorhifi Acquaintance

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    Might as well describe how I managed to mod mine as I didn't use dynamat. In Spain I can only buy it in big sheets for around 49€ a piece. Keeping that in mind I searched for alternative materials and found some spare replacement rubber feet. It's quite thick (1cm) and somewhat heavy for what it is. Maybe dynamat is better, but I can attest to everyone else's findings here (better bass, focus and overall "livelier" sound). Here is what I did and my findings along the way:

    1) Removed rear foam (2 pieces per driver in my case). Realized it sounded much less damped, but the bass was way overblown (a good 3-5db at 100-200Hz) and it started to be a bit sibilant at times. Overall not bueno, albeit the positives were there in the form of a livelier, less boring sound signature. Better transients for sure.

    2) Put one of the foam discs back into place (huge pain to do btw), which left it at a good middle-ground. I highly recommend doing this to anyone who is afraid of doing the rest of the non-removable mods. Heck I even think Sennheiser should ship the HD650 this way. It's just one foam piece less they have to use for a significantly faster transient response. I kept mine this way for a solid month or two and was very happy.

    3) Said to heck with this wolly Sennheiser sound and cut the spider-cage out, applied my dynamat replacement (1cm thick rubber feet meant for furniture) and left only one foam piece in there. I didn't expect much (silly me), but the bass tightened up massively. I noticed it from the second I plugged them in. What an improvement! The wolly sound is gone and now I have a supercharged HD650++.
     
    Last edited: Jan 5, 2021
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  7. señorhifi

    señorhifi Acquaintance

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  8. spoony

    spoony Spooky

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    Reminded me that I never showed my mod:
    photo_2021-01-05_15-42-52.jpg

    That's dynamat plus a 1" sorbothane washer double-taped over the backside of the driver assembly (spider removed), thick fibrous felt inside with a hole sized to tune the bass.
     
  9. PacoTaco

    PacoTaco Friend

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    I haven't done this mod in awhile, but any butyl sound deadening stuff should work, right?
     
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  10. señorhifi

    señorhifi Acquaintance

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    BTW and I don't know how I didn't think of this before, but Dynamat has a million alternatives and copy cats of sorts from a ton of other brands. Some stuff even appears to be better than Dynamat in terms of raw sound dampening properties. In Spain I found this from a local retailer for 7€ plus shipping, for two 30x30cm squares: https://www.solocaraudio.com/insonorizacion/7278-standartplast-black-silver-speaker-kit.html

    Works very well on my HD650KISS, maybe a bit better than what I used before (some random rubber feet lol). Oh it's also self adhesive, so that's cool.
     
    Last edited: Feb 5, 2021
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  11. JayC

    JayC Resident Crash Test Dummy

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    Indeed, there are a lot of alternatives. A common one on this forum is Damplifier (Pro), which is even considered to be better than Dynamat.
    I looked around here in the Netherlands for options but it seems that I ran into options that were of lower damping properties than Dynamat xtreme.. For example Noico and KKmoon.
    Im not sure what the damping properties are for the one you posted a link of, but if it works for you thats great! :)
     
  12. Tekker

    Tekker Acquaintance

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    Is that white tape micropore?
     
  13. spoony

    spoony Spooky

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    Yeah but I don’t think it does much / anything.
     
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  14. Tekker

    Tekker Acquaintance

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    And what is that stuff around the nylon mesh? Doesn’t seem to be stock
     
  15. spoony

    spoony Spooky

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    The washer?, It's a 1" sorbothane washer, you can find them @ Amazon.
     
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  16. Tekker

    Tekker Acquaintance

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    No I mean the material I’ve outlined with red, that you placed on the stock oval mesh.

    [​IMG]
     
  17. spoony

    spoony Spooky

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    That's stock, I own the 'silver mesh' version, there are also 'black mesh' versions which are older, I believe. There's a few posts here and elsewhere trying to find differences between the two.
     
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  18. señorhifi

    señorhifi Acquaintance

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    I have been doing research and turns out the material called STP Aero Gold is about as effective as Dynamat Xtreme or Damplifier Pro. STP even has a more powerful solution called "Aero Bomb" which is around 4.5mm thick. In the end I ended up putting Aero Gold in mine and works very well.
     

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