HD800 "French Mod" aka "SuperDupont Resonator"

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

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  1. mtoc

    mtoc SBAF's Resident Shit-Stirrer

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    Would we really could put the hd800 drivers into the enclosures of the sr007?
     
  2. MrTie

    MrTie Friend

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    "Super Dupont" received and installed. They are def attenuating the treble spike down as well as my previous EQ without crushing the air as much. Very early impressions but I like it a lot. Thank you so much Sorrodje! I will post a lengthier impression when I have more seat time.
     
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  3. JoshMorr

    JoshMorr Friend

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    Package received, nothing squished, they look perfect. Thanks @sorrodje ! Will install tonight and report back in conjunction with the various other current mods.
     
  4. M3NTAL

    M3NTAL Friend

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    My package arrived safely today. They were a little tough to get started into the hole (Very tight fit). Giving them a thorough listening session now!

    Thank you Sorrodje.
     
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  5. JoshMorr

    JoshMorr Friend

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    Not that we need any more proof that these resonators work, but they really really sound fantastic. Better separation of the soundstage, cleaner mids that are more present, maybe tighter bass? Either way - huge improvement.

    I've been listening to records for about 2 hours now and enjoying myself, not getting fatigued which used to happen with these headphones after about 45 min. I am currently doing cork mod, sbaf absorber mod, and the SD resonator. Might be overkill - but I wont take em off to try and see if I would like better without absorber.
     
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    Last edited: Mar 14, 2016
  6. logscool

    logscool Friend

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    I've actually since that original quick measurement taken many more and noticed no real increase in bass distortion. Not sure what was happening with those original measurements.
     
  7. stratocaster

    stratocaster Friend

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    Resonators (look professionally made, fit snugly) have been installed. This mod does show consistency!
    Measurement on my rig:

    stock_vs_sd.jpg

    These are very much like the classic HD800, tonality seems unaffected, bass distortion does not get worse, and MUCH of the harshness that could formerly be experienced on some tracks has gone. I cannot imagine anyone who has listened to these, will feel the urge to take out the resonators again. Very well done Sorrodje, I certainly like the results very much.
     
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  8. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    Thks @stratocaster.

    Did you take care to push the SD resonator at the bottom of the hole and then pull the drilled creatology disc flush to the top ? it ensures the biggest cavity and the maximum performance IMO.

    Results are indeed consistent but not similar. it could be measurements difference but I think the precise positionning matters. I didnt experiment to squish the resonator at the bottom to see if the results were different. I always pulled off a bit the creatology part to leave it flush to the top.

    Relative consistency is a good point though. the SD resonator is designed for that purpose ( easy do DIY, close to HD800S, easy to consistently produce, consistent results was the specs)
     
    Last edited: Mar 15, 2016
  9. stratocaster

    stratocaster Friend

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    There will always be differences when you look at measurements taken on different couplers, microphones, etc. Positioning, seal, pressure etc. are all variables that have great effect and may impair comparison. What matters, though, is that we see the relative differences (on a special rig) that mods make and that we have a common reference point, like measurements of an HD600 on that very same rig, so that we can assess a headphone's measurement on the background of the reference point.
     
  10. stratocaster

    stratocaster Friend

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    So, I just installed brand-new HD800 pads, made sure the resonator was pushed to the bottom and the creatology raised back up flush.

    new.jpg
     
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  11. stratocaster

    stratocaster Friend

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    Might be interesting, as above (new pads, resonator)but with a small velour pad as 'inlay' around the driver opening:
    newest.jpg
     
  12. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    Yes ! Much better. see how the 4 khz is no more dipped and the 4 khz to 6 khz range is much more lifted ;) and that's definitely more in line with my own results.

    @Tyll Hertsens : If you have some time, it would be interesting to check if your resonators are perfectly fitted ( paper at bottom, Creato flush to the top, resonator fully extended in the hole ) and measure it.

    I'll write a reminder about mounting in the summary. :bow:

    About Distorsion, I'm almost convinced I did all measurements of my attemps way too loud. Need to check my SPL calibration. :drunk:
     
    Last edited: Mar 15, 2016
  13. Tyll Hertsens

    Tyll Hertsens Grandpappy of the hobby - Special Friend

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    Pretty sure I had them in like that. I fidgeted with them a bit to get it to line up. I'll double check and take new measurements when I can.
     
  14. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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  15. stratocaster

    stratocaster Friend

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    Maybe Tyll could find some time and try a velour inlay as described in my 'Neutralize the HD800' thread?
     
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  16. listen4joy

    listen4joy Rando

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    sorrodje, just curious why you closed one side of the resanator, why there is no holes in both sides, the result was bad?
     
  17. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    @listen4joy : Fully closed your mean ? on top and on the bottom ? the most "closed" attempt I did ( creato, felt, rubber , tips ) gave bad results. Improvements came when I understood the Seen resonator was a cavity so I tried to mimic that ;)
     
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  18. listen4joy

    listen4joy Rando

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    what is the diffrences that you experinced beetween the mod with the holes exposed and the current mod that one of the sides cover by a cardboard?
    thnx!
     
  19. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    @listen4joy : I already gave measurements ;)

    [​IMG]

    Yellow is current closed resonator. Light green is open back one ;)
     
  20. listen4joy

    listen4joy Rando

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    small things make big improvments, bravo!!!
     
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