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HD800 "French Mod" aka "SuperDupont Resonator"

Discussion in 'Modifications and Tweaks' started by sorrodje, Jan 17, 2016.

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  1. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    @dubiousmike : the 3mm is flush with the top of the hole in order to let free space between the tip and the bottom. ;)

    @all : I still don't know if our goal is to put damping material (usual suspects: felt, open cell foam of various density, ... ) in the hole ( that works a bit but I don't think it's what Senn did) or to simulate a helmoltz resonator aka to create a bottleneck ( kind of shutter/stopper with a little hole in the middle ) that closes the hole and some free space under. or maybe a mix of both.

    My friend Hubert told me to check if the porosity of the grey mesh around the HD800S' cup is the same than for the HD800. it seems we agree on the fact that maybe Mesh could differ and the "thing" in the HD800S hole is maybe not the be all end all that transforms a HD800 into a HD800S.
     
    Last edited: Jan 27, 2016
    sorrodje, Jan 27, 2016
    #141
  2. SKiring

    SKiring Friend

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    Will be interesting to see what you come up with. To a degree, after hearing the HD800S I'm not sure if I don't think that it's a bit too much dampened for me, the little sparkle was gone (in my short audition, need much more time to make any authoritative statement). So my goal would be to reduce the treble with extra bells and whistles as opposed to a perfect HD800S clone, I'd probably still mod a HD800S even if I would go that route. :)

    I'll be reading your suggestions with great interest @sorrodje, that said, with the current Shure foam tips + the rest of my mods, I'm exceptionally happy. So far that it has completely dominated the listening time of the HD650, while this was never the case before, the fact that I have it on for hours goes to show that something great is going on. So whatever it is, it's working for me. At this point it's more my very curious mind about the last few %es than the need for more!
     
    SKiring, Jan 27, 2016
    #142
  3. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    I have the shure, bluecell, and Sennheiser foam tips coming in to try..
    :)
     
    Maxx134, Jan 27, 2016
    #143
  4. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    Just received the caliper to measure the center hole in the hd800s resonator : 7mm.

    But If I'm not wrong and @whipped and this guy (http://www.head-fi.org/t/785577/sennheiser-hd800s-unveiled/2955#post_12292037 ) are the same and only guy, it seems @whipped solved the problem. He announced on head-fi it's easy to fix the 6 khz to his ears and that measurements doesn't matter. So let's wait what he proposes.

    Maybe those are two different Australians that play with 5,5 khz and 6 khz single tones in order to judge effects of mods ? :D .
     
    Last edited: Jan 28, 2016
    sorrodje, Jan 28, 2016
    #144
  5. T.Rainman

    T.Rainman Acquaintance

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    does anybody (except Sennheiser) know if the real resonator is just a single 'pipe' or that it looks more like this inside ?

    [​IMG]
     
    T.Rainman, Jan 28, 2016
    #145
  6. frenchbat

    frenchbat Almost "Made"

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    Oh that's gonna be interesting.
     
    frenchbat, Jan 28, 2016
    #146
  7. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    not sure because it's hard to check but it seems it looks indeed like this . I can't tell you if the dimension of the cavity are still 7mm deep and 14mm large though. the hole is 7mm and I can' see if the shutter is thin like a paper sheet or thicker. I don't have the appropriate light to check that perfectly.
     
    sorrodje, Jan 28, 2016
    #147
  8. SKiring

    SKiring Friend

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    Wait that's really interesting. Maybe if we close the foam tips with something at the end instead of the top, we get better results?
     
    SKiring, Jan 28, 2016
    #148
  9. hifi01170

    hifi01170 Acquaintance

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    sorry if stupid but doesn't it defeat the purpose.... from my understanding we need to create a "sealed" cavity with a hole on top....
     
    hifi01170, Jan 28, 2016
    #149
  10. SKiring

    SKiring Friend

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    That's what I mean. :) Closing it on the closed side of the hole, while leaving a hole like the resonator, it would essentially be the same principle if that's what the Resonator is like.
     
    SKiring, Jan 28, 2016
    #150
  11. T.Rainman

    T.Rainman Acquaintance

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    I suspect the visible part may just a be a 'foam ring', the underside will almost certainly be sealed off.
    The thickness of that ring is of importance as is the air volume inside the resonator.
     
    T.Rainman, Jan 28, 2016
    #151
  12. hifi01170

    hifi01170 Acquaintance

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    same page! :piratemug:
     
    hifi01170, Jan 28, 2016
    #152
  13. zerodeefex

    zerodeefex SBAF's Imelda Marcos

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    so, just to recap:

    7mm inner diameter, 14mm outer diameter
    closed cell foam
    sealed at bottom

    What is the agreed upon height?

    I can probably ask the guys at the lab to help whip up something to these dimensions.
     
    zerodeefex, Jan 28, 2016
    #153
  14. SKiring

    SKiring Friend

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    The thing is however that after hearing the HD800S, I'm not sure I want that. I want damping
    Interestingly @sorrodje mentioned that a 3mm tip was the best result in measurements.
     
    SKiring, Jan 28, 2016
    #154
  15. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    @zerodeefex : basically it looks like something like that . at least for seeable specs. What we don't know is the thickness of the top shutter and the inner diameter and inner depth . 14mm is the outer diameter.

    I sourced and bought a bag of things to try and measure...
     
    sorrodje, Jan 28, 2016
    #155
  16. zerodeefex

    zerodeefex SBAF's Imelda Marcos

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    Just a heads up, all of Sorrodje's work and art are going to be covered under a creative commons sharealike license as well WITH requirements for full attribution. Any mention of the mod elsewhere will need to reference the SuperBAF HD800 SuperDupont Resonator mod by Sorrodje.

    If you have created a derivative work, please reference this on whatever forums you're posting.
     
    Last edited: Jan 28, 2016
    zerodeefex, Jan 28, 2016
    #156
  17. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    Fuuuck. just received the tool I needed :

    [​IMG]

    A full set of twinnable hollow punches.. and guess what ? There isn't any 7mm in the set... :Violin: ... just ordered it on Boehm Website.

    Bought that to cut shitload of various sheet of material (creatology , felt, open cell foam, rubber) and create 14mm rings with 7mm center hole.
     
    sorrodje, Jan 28, 2016
    #157
  18. spoony

    spoony Spooky

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    Try the dense makeup pads, they can be had at the supermarket.
     
    spoony, Jan 28, 2016
    #158
  19. SKiring

    SKiring Friend

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    Agreed entirely Ravi @zerodeefex.

    @sorrodje, so I out of curiosity I tried to "close the tip" on the bottom side thing, I just used a piece of paper. It could measure well but the bass extension felt gone, there was something missing overall... I didn't like it personally.
     
    SKiring, Jan 28, 2016
    #159
  20. T.Rainman

    T.Rainman Acquaintance

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    Is trying to copy Sennheisers work on the HD800 (the resonator) something that can be covered under a creative commons thingy ? :D :rolleyes:
     
    T.Rainman, Jan 28, 2016
    #160
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