[Josh 416]

I was wondering what type of mods there are and how they help for headphones I've never done one and was wondering how they would give headphones a certain advantage

 

[Music Alchemist]

Too many to list. Here are some examples:
 
http://www.head-fi.org/t/754839/stax-sr-009-and-sr-007-mk1-earpad-diy-mods
http://www.head-fi.org/t/646812/hifiman-he500-he400-jergpad-mod-v2-5
http://www.head-fi.org/t/619447/hifiman-regrilling-mod