[Maxx134]

Can I only do the bass mod for increased bass or do I have to to do all the other mods to get the "full" bass sound?

You should just try the insert .
It's a cheap easy placement of using the specific Senheiser tips mentioned.

 

[Maxx134]

I am currently working on a different mod to alter the HD8000 FR:

Simultaneously increasing lower bass while also increasing clarity in middle range:

HD800SDR:


My New mod:


I do not compare to stock HD800 as it would not be fair, as I expect most owners to use the SDR by now.

Bass levels should be up about 8db from stock and at least 3db from an HD800S, although I haven't been able to measure one yet.

So all this is ongoing while I see if I can tailor the FR some more to reduce the 4.5k dip.
This is before the dip correction.
Here is a CSD:


Cheers.
Edit:
10khz & up would be considered "air" and shows I have not dampened or muted the upper range with materials with would kill soundstage.
Instead I have a larger & deeper image than before.

It's progress but not complete for me untill I address FR more.

Edit*:
Forgot to mention the whole CSD primary image is way under the 1ms line & actually all is way before even half the first 1ms box, which only 450hz point shows at that point.
So initial image is clean.

 

[Maxx134]

Ok I been further experimenting with "transient response" and tonality.

From my FR grapth, you see my aim was for the more involving sig of both the Susvara and Abyss in the lower spectrum.

That combined with what I have been learning about how transient response pertains to sonic impression.

So I changed the HD800 transient response for aa transient response to be like what I researched, which stated that for the step response to be more like a speaker, it must drop below zero for a sufficient time to produce a net output of zero over time.

This involved and affected the imaging, "agressiveness", and dimensionality.
These parameters were then optimally changed.

So I ended up making the sound more open & holographic while having more of a perspective of "being there", as opposed to "being presented" an image.
This, with the tonality change adds to a more "live" experience.

"Clarity" graph was substantially increased in lower spectrum, but can also be a reflection of the bass increase.
Bass sensitivity incrimented another 2-3db on top of last FR grapth.
Total bass level is now substantial enough.

Treble has also been altered, not for any 6k issue as that has been addressed/corrected and is totally non-existent even in distortion measurements.
This done in a new way, unlike "center-driver" mods.
So treble progress made and is being tuned for non-sibilance, WITH extension.

Edit** Although visually this is an HD800,

it is no longer an HD800 sonically.
It is more like "stax009"(livelyness) mates "Susvara"(openness) to me.
Makes normal HD800 versions sound flat ("2D") and less real.
Will post measurements soon.
Not done yet.
This will be next project.
"HD800X" project.

 

[Thenewguy007]

Ever think of trying these new earpads?

Leather, but not as thick as the Dekoni, so they shouldn't mess with the signature too much.
https://www.amazon.com/misodiko-Upg...=UTF8&qid=1543095904&sr=8-7&keywords=misodiko
https://www.amazon.com/dp/B07G4FKXKG/ref=psdc_13880181_t3_B07GSWPXV1

 

[Maxx134]

Ever think of trying these new earpads?

Leather, but not as thick as the Dekoni, so they shouldn't mess with the signature too much.
https://www.amazon.com/misodiko-Upg...=UTF8&qid=1543095904&sr=8-7&keywords=misodiko
https://www.amazon.com/dp/B07G4FKXKG/ref=psdc_13880181_t3_B07GSWPXV1

I have seen three or four iterations of replacement pads on Amazon.
Every single one of them will changed sound somewhat.
Even worn shallow pads make HD800 sound different.
Cheaper price is nice.
I personally prefer Dekoni ferenstrated pads.
The plastic under the cheapo pads are there for bass leakage prevention.
Dekoni needed to implement this.
It helps but not much.

I have edit my past post a bit.
I am on my phone so easy to typo and skip things.

 

[Maxx134]

Ever think of trying these new earpads?

Leather, but not as thick as the Dekoni, so they shouldn't mess with the signature too much.
https://www.amazon.com/misodiko-Upg...=UTF8&qid=1543095904&sr=8-7&keywords=misodiko
https://www.amazon.com/dp/B07G4FKXKG/ref=psdc_13880181_t3_B07GSWPXV1

According to my experience in generall, those specific pads will probably give a bit tighter bass but more closed in & bit darker sound.

 

[omniweltall]

According to my experience in generall, those specific pads will probably give a bit tighter bass but more closed in & bit darker sound.

That is my impressuon as well. Im using dekonk fenestrated as well. My worry is more on details and resolution.

 

[Maxx134]

update on the HD800"M" project .
cleaned up the lower spectrum .

more clarity .
this becoming a true all genre headphone now.


getting closer .
check bass extension .

 

[omniweltall]

update on the HD800X project .
cleaned up the lower spectrum .

more clarity .
this becoming a true all genre headphone now.


getting closer .
check bass extension .

Looking good, Max!

 

[Maxx134]

update on the HD800X project .
cleaned up the lower spectrum .

more clarity .
this becoming a true all genre headphone now.


getting closer .
check bass extension .

Update here was I reduced the dip of the new signature, and made some FR changes, but I want to tune the image "distance" a bit more and then thinking to present it to Senheiser in coming months, as intelectual info, since it is a modification that can be done by them.
I haven't done anything more yet, as I was testing the reliability of the mod.
Next step is to squeeze out more low end extension.

Here are more measurements:

CSD, 40db down in a 2ms window(!).

 

[audiophiliac69]

For anyone with a Senheiser HD800, this is THE tread to follow. And it is not IMHO, if you think I am wrong point me to a more credible thread.
I want to thank you for all your work on the HD800 and patience with the nay sayers.
Looking forward to HD800X project. Keep up the excellent work. Color me impressed!

 

[Maxx134]

ver think of trying these new earpads?

Leather, but not as thick as the Dekoni, so they shouldn't mess with the signature too much.

Check this post

This implys that distance of the driver was intended in the design.

This is why the Dekoni pad is preferable to me.

Others may prefer stock size pads, as it also gives a bit more closer and darker image.

 

[Maxx134]

Here is a another mod help for those with Dekoni pads, and are experiencing less bass..

Buy THESE Gesongzhe Earpads for the hd800, to extract (by cutting) the silicone membrane (needed for bass seal)...

It is a softer membrane than the stock pads, which use soft plastic.

Both work, but the silicone membrane is better.

Carefully cut out the silicone membrane...


It says plastic, but to me it feels more like silicone.
THIS is what preserves the bass!

install it between the dekoni pads and the headphone.

Result is improved bass!
Dekoni chose to not implement this, as a trade off for having it's "twist off" removal feature..

This is implemented in my latest version to get more sub-bass extension.

 

[Maxx134]

I will be at canjam with my latest HD800M if anyone wants to hear.

This is my latest and totally new mod of mine for the HD800, with a deeper, larger, more neutral s& non-diffused sound, without any center insert, or any internal damping of cage at all, for maximum soundstage.

 

[Thenewguy007]

Nice paint job, where did you go to get it?