Hi again, guys.
I've made a fully reversible MOD on my IE80's to get rid of the annoying mid-bass hump (that makes sub-bass and midrange regions veiled) , without spending another 150$ on High-end Silver Cable. Russian guys (the one behind the idea) called it -
Sennheiser ISO-Mod.
The idea is to reduce the internal resonance of the earphone, that cause too much reverberation and bass emphasize. As a result the IE80's midrange totally opens (becomes incredibly sweet) and the sub-bass region start hitting same strong as the mid-bas, making it more organic, but also less punchy. Personally I find it way more refined then the original bass-heavy and muddy presentation.
To get better idea of the result, it is like turning bass-heavy Denon D5000 into Sennheiser HD600.
This is what you need :
a) Delicate scissors
b) Insulating tape
c) Good lightning and Patience.
Cover the back of the earphone entirely and monolithic with Insulating tape. The rest surface of the earphone might also be covered, it's almost impossible to make it monolithic, but the less parts you use, the better result you get. Be aware to leave the black-plastic element near the L / R letters intact (don't cover it).
The more layers you put, the less mid-bass you get. I've find my sweet spot on
two layers.
The only major downfall is turning a beautiful and saxy earphone into an ugly, cheap looking dinosaur. After you've made the mod, your friends might not recognize your IE80, thinking you are wearing typical chineze crap like most of them do... Personally, I can live with that...