

3. Air Filter Mod
It is more thicker than the original one but the pore and other else almost the same as the original one, I'm worried it will damping too much.
I cut 2 circles and then make it a donut so It wont covered the driver, a bit hard to attach the ear pads since the inner foam a bit thick but with perseverance I manage to attach the earpads.

from ATH site.
Its testing time..
Oh my god, the sounds I can say a bit better than the stock R70x.
The low just have more texture and clearer.
The mids become really vivid and more articulate.
The treble a bit tame but it doesn't affect the soundstage and imaging..
I can say that it is almost sounds like the tube amp, everything a bit slow but still can handle busy track and pinpoint quite precisely.
Yup, I manage to save my R70X, and make it better (for me)..
Hope this one help if you looking for inner foam replacement, and by the way sorry for not so good english