[Bryan E]

The metal has a foam layer under it, which hampers the dynamat effect of solidifying the driver to the basket frame.

IMO, Sennheiser made a mistake using foam, instead of the sobothane ring they use under the driver. I personally believe this was not as designed and a change because of cost and replacement would be easier with the foam on that metal ring, instead of sorbothane.

So if you don't want to use the dynamat as a replacement, you could try cut out a super thin sorbothane or silicone layer to put under the metal ring, and flip that metal ring upside down for more solid bond.

I C thank U for your info ... Is there a way to mechanically increase 1-2khz region because that is IMO the only weakness of HD800 that hasn't been resolved by any mod as of now hahaha

 

[Bryan E]

How thin should the silicone layer be? About 1mm?? And should the dynamat behind the driver replaced with silicone too to match the one in front? And how thick should the silicone behind the driver be?

 

[Maxx134]

I C thank U for your info ... Is there a way to mechanically increase 1-2khz region because that is IMO the only weakness of HD800 that hasn't been resolved by any mod as of now hahaha

Try the specific Sennheiser foam tips (to place in center driver) I recommended in beginning of thread.
It is probably the first mod anyone should try.

How thin should the silicone layer be? About 1mm?? And should the dynamat behind the driver replaced with silicone too to match the one in front? And how thick should the silicone behind the driver be?

After my own trials, I actually don't recommend any silicone because it requires compression that the screws cannot give.
You would actually have to do a nut an bolt all way thru and end up having to discard the whole plastic rear and grill.

Its not worth the effort to try, plus it will not have the advantage of increased mass, which is what is needed to properly eliminate resonances, and results in the increased presicion of soundstage. (No artificial soundstage haze).

 

[Peter19500]

Sorry

 

[Peter19500]

Please specify more precisely these materials:

"BASS Pressure/COUPLING SEAL" MOD.
specific material to slow down the bass pressure from escaping pads
sub-bass seal and Impact preservation, inserted to the inside of ear pads.

*2-rear grill Anti-reflection mod,
This is accomplished by using specific deflective material by grill.
Yes those mesh metal screens in rear affect sound,
but you don't have to take them off (idiot approach).
No grill removal is necessary, as other mods, and this solves listener fatique from rear reflections.

Ideally it would be to link to store pages. Thanks for your work!

 

[Maxx134]

Please specify more precisely these materials

Hello, here is pics of the exact material I used. I am pretty sure you can get similar type:


Another pic for size comparison next to other items (cloth tape & screwdriver).



Also,
I do not use the rubber tape or the stock pads anymore for bass.

I only use and recommend the Dekoni elite ferenstrated sheepskin pads:



And to gain lost bass, I use the silicone from normal velour stock or replacement pads.

I cut them out to place in between the unit & pads(plastic area), when I place the new Dekoni pads on.


Good luck!

 

[Peter19500]

Dobrý deň, tu sú obrázky presného materiálu, ktorý som použil. Som si celkom istý, že môžete získať podobný typ:


Ďalší obrázok na porovnanie veľkosti vedľa iných položiek (látková páska a skrutkovač).



Tiež,
Na basu už nepoužívam gumovú pásku ani podložky.

Používam a odporúčam iba podložky z ovčej kožušiny Dekoni elite:



A aby som stratil basy, používam silikón z normálneho velúrového materiálu alebo náhradné podložky.

Vystrihol som ich a umiestnil medzi jednotku a podložky (plastová oblasť), keď na ne položím nové podložky Dekoni.


Veľa štastia!

Ok super. Thank you very much for your quick reply. I still have the original pads in perfect condition. Should I adjust them for better bass?

 

[Maxx134]

For using stock pads, the easiest thing to try, is something very flexible and easy to fit inside the pad perimeter.
So would try some silicone tubing inside:


They key is the material being very soft and which can bend easily inside to make the turns. That's why silicone is an good choice.

I will try this tomorrow.

 

[Peter19500]

https://www.ahifi.sk/antivibracny-material-comfortmat-dark-d2.html
I have this at home. Can I use it? I also bought a silicone hose.

 

[Peter19500]

Is the hose enough, or is it necessary to replace the original hard plastic with a soft one?
https://www.amazon.com/dp/B07T64X8X2/ref=cm_sw_r_other_apa_i_ZTPwEbNFJ3BPW?tag=headfi-20

Thank you very much for the information.

 

[Maxx134]

https://www.ahifi.sk/antivibracny-material-comfortmat-dark-d2.html
I have this at home. Can I use it? I also bought a silicone hose.

Interesting material to try.
Can't hurt to try.

Is the hose enough, or is it necessary to replace the original hard plastic with a soft one?
https://www.amazon.com/dp/B07T64X8X2/ref=cm_sw_r_other_apa_i_ZTPwEbNFJ3BPW?tag=headfi-20

Thank you very much for the information.

That's good to try as is.

I have not tried it yet since i am not using those pads.
But that is the correct intention an placement.

 

[Peter19500]

Does this need to be glued together? If so, with which glue?

 

[Maxx134]

Does this need to be glued together? If so, with which glue?

No glue at all. Just lay inside and close over driver.

 

[Peter19500]

I would like to thank Maxx134 for his willingness and advice. Here are some photos from my HD800 edit. Tin for soldering served as a pedestal for me at work. Metal ring as a template when cutting.
I will still be doing the 800 "S" resonator mod. I ordered.

 

[Maxx134]

I have refined some frontal elements . I decided to use metal washers on the screw,

for better pressure displacement, and zero absorbing properties.

Then the black foam from the original(replaced) metal ring, is repurposed to be used on top of the dynamat ring.

...

So you have original surface properties, and nothing else.

This is my HD800SM mod. It has nothing else applied in this whole ear chamber.
NOTHING ELSE BELONGS HERE!
No material inserts or rug liners, which destroy soundstage.

Remember I consider tonality alterations both a compromise, and kindergarten work with no real performance correction or gains. Just masking the problems with "bandaid" solutions...