HD800 (S) Ultimate Mod

Discussion in 'Modifications and Tweaks' started by Maxx134, Apr 27, 2018.

?

Are you satisfied with HD800 bass?

  1. yes

    21 vote(s)
    23.3%
  2. Its ok

    27 vote(s)
    30.0%
  3. Not really

    21 vote(s)
    23.3%
  4. Hell no, I want planar bass

    25 vote(s)
    27.8%
Multiple votes are allowed.
  1. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    This is an HD800 to an 800S mod, made more clear than past mods,
    plus secrets learned along the way.

    I will first post the performance evidence, then followed by the procedures, and discoveries made alone the way...


    HD800 to an HD800S mod:

    FR:
    HD800 Ult FR.PNG
    notice elevated lower spectum to bass, and gradual elevated upper spectrum, no dips... previously impossible to have without the 6k ringing..


    CSD:
    30db down.
    HD800 Ult CSD.PNG
    Notice decay is faster than .5ms all way down to 1k, no 6kringing like stock and even 800S

    Here is a screenshot of the best fabled never released annax mod:
    pic
    Annax2.png
    At 50db down a slight 1-2ms decay in trebles, (arguably the cleanest ever made)

    Now here is mine 50db down:
    HD800 Ult 50db Right CSD.PNG
    (click to expand as looks too big to post large)
    At a deep 50db down, a .05-1ms most delay in WHOLE trebles range is proof of no ringing(!)
    Yes it is possible but MUST be done specifically as I recommend, or you will waste your time.


    Distortion:
    HD800 Ult Distortion.PNG
    Notice that the harmonics below noise floor,
    And also to see is unique is the horizontal linearity of the harmonics.

    In this one, the ambient noise was too high, so the white line (THD) reflects that,
    and I removed the bass as debatable points because of the noise, but it was a gradual incline with the bass.
    So the Bass measurements were too skewed because of the dam ambient noise so I will try update in future post.

    One important point to note to make,
    is that no other HD800 has ever had a linear distortion (no spike) in the trebles range,
    and also stay below the noise floor... ever..(that I know )..

    This was the last HD800"S" Mod I made before I sold mine.

    I have been planning to post this mod to the comunity when I have the time, which I finally have this coming week.

    EDIT:
    Hear is my Impulse response.
    HD800 Ult Impulse4.PNG
    I put the mouse to highlight the more important 20db and the 500ms markers..
    They are considered more important areas.
    I found and posted key notes about impulse, and posted further down next posts.

    *There is Less negative overshoot than an 800 or 800S.
    *Lesser second upward spike after the initial transient than an HD800 or 800S...
    *The Impulse has tighter rise & fall of the lines (to the red line), compared to stock.
    All after second spike is below the 20 mark.
    All after 500ms is less than an 800 or 800S.


    About this mod:
    There was no mod available, to make an HD800 sound similar, (but better) to an 800S...
    So this was the goal... To have that hallmark Sennheiser trebles and better bass than the 800S...

    This mod WILL give you the bass, without the added blurry harmonics of the 800S(!).

    This mod WILL preserve the treble "air" and signature Senn trebles, that other mods either kill off(rug liners & creatology foams) ..

    This mod NOT intended to replace the neutral "Super Dupont" mod,
    which flattens and evens out the trebles...In order to also lessen the 6k resonance.

    This mod CAN be partially applied to FURTHER REDUCE riging in the "Super Dupont" mod..
    Essentially making it superior to the fabled never released specs of the annax mod.

    This is the only mod that eliminates the resonance problem WITHOUT killing, or neutralizing the trebles...

    I had bits and pieces of this mod scattered everyhere but will compile into this one thread.
    This is an all unique mod comprising of nobody else tweaks, liners, etc..
    It was a year long project that me and another member @ Olegausa finished about over a year ago,
    so is about high time it gets revealed.

    The measurements here are from his headphone, to be impartial.
    The upgrades revealed will be up to the user to try.
    :)

    next posts coming soon...
     
    Last edited: May 5, 2018
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  2. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    :p
     
    Last edited: Mar 31, 2020
  3. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    :drunk:
     
    Last edited: Mar 31, 2020
  4. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    EDIT, PLEASE READ...


    There is another reason why this specific method of damping works.
    *EDIT* update pending
     
    Last edited: Jun 5, 2019
  5. ultrabike

    ultrabike Measurbator - Admin

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    Some stuff seems amiss...
    1. Your CSDs lack resolution.
    2. Something does not seem right about your impulse response relative to your frequency response. Too little post cursor. Will have to look at my measurements when I get back home. What is the impulse response of the system before mods?
    3. Sufficiently quite environments (like any room with the TV off) should yield way better distortion measurements than that.
     
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  6. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    Ans:
    1- last two were sceencaps from a phone. First image is clear I can make more.
    2-We can clear that up. Let me know what settings you want in the impulse window. They were stock settings in REW.
    I can do ARTA also, It was not as convenient at the time.
    3-I actually do have quieter measurement , I forgot about them so I will post.

    If you like I can send you my REW files so you can check it would be great help.
    I have not done the HD800 in ARTA but can get that next time I visit my friend.
    Thanks for checking it out.
     
  7. ultrabike

    ultrabike Measurbator - Admin

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    For now, just do the impulse response before and after mods.
     
  8. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    good idea, I will look for another hd800 to measure.
    I do not currently have stock or anyone else to measure yet which would be best.
    Edit:
    Here is what I get in REW:
    I just realized my REW setings were off.
    This what happens when I rush.
    HD800 Ult mpulse 2.PNG
    I will try ARTA next.
     
    Last edited: May 3, 2018
  9. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    Edit you were right and have keen eye.
    that last measurement had the "channel step response" highlighted.
    Actual Impuse was in purple, I needed my glases on this 9" tablet ,ug.
    still I do not like how REW is showing it,
    Look above\\\
    so I will try ARTA next time.​
     
  10. Bill-P

    Bill-P Level 42 Mad Wizard

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    Cool measurements, bruh, but...

    ...Pics and instructions or it didn't happen! That's all I care about now anyway. :punk::punk::punk:

    |\/|
     
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  11. ultrabike

    ultrabike Measurbator - Admin

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    This is more or less the impulse response I was expecting for a stock HD800:

    impulse_left.png

    Given your FR measured response after your mods (somewhat close to what I measured in the past on the stock HD800), I was expecting something similarish before and after.
     
    Last edited: May 2, 2018
  12. ultrabike

    ultrabike Measurbator - Admin

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    Anyhow. Best to do a comparo in your own rig before and after.
     
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  13. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    Ok
     
    Last edited: Nov 30, 2019
  14. ultrabike

    ultrabike Measurbator - Admin

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    I had good results with REW. In fact, the impulse I added in this thread is from REW. But use what you feel most comfortable with.
     
  15. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    The good news is that it was just that my settings were off.
    I always relied on CSD.
    So once home I will play with the settings.
     
    Last edited: Nov 30, 2019
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  16. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    Imp compr2 labled.png Imp compr2 labled.png :drunk:
     
    Last edited: Mar 31, 2020
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  17. TwoEars

    TwoEars Friend

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    Less graphs, more mod pictures.
     
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  18. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    Ok I done with updating the post, added info about the Impulse Response.

    Ok today I will Be posting the mod instructions.
    :punk:
     
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  19. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    Second post just redone now with the "preface"..

    Third post will be the actual instructions which I hope to have up by today.
    Pics already uploaded to "Imgur".
    So halfway there...
    :sail:

    **EDIT:

    Ok, I am all done writing instructions,
    Signal bad in office,
    so will post once home tonight.
     
    Last edited: May 4, 2018
  20. Maxx134

    Maxx134 Dunning–Kruger effect poster boy

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    OK....
    Fulll mods are posted.
    Get'em while you can...
     
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