I've had "success" in adjusting my SR80i's with some slight eq'ing (along with the L-cush pads & the tape mod).
Followed Tyll's suggestions from the Grado-pads post and am very happy with it.
Having said that, calling it "fixing" headphones goes a bit far. The headphone's natural signature can be adjusted, but it's at the margin. I.E. If you are already a fan of the 'phone but want it to be a little bit "better" / "different", eq'ing can help you do that. So, you want to the Grado's a bit, a slight drop around 2 khz may be just what you need.
You can turn a really good headphone, into a great headphone.
In the end, it's a matter of degrees and I definitely would not expect agreement from the head-fi community on this type of a thread.
Best of luck in your quest.
Thanks. I did put the "fixed" in quotations as I felt some would not agree. By "fixed" I mean what that individual would consider to be an improvement or problem solver. Doesn't necessarily mean an improvement for everyone else. The idea/wishful thinking was to make a thread that newcomers could look at and see which headphones they could add to their potential buying list based on their preferences. Headphones that they wouldn't have considered but can not because what they are looking for can be had with a little EQ.
Edited by RayleighSilvers - 5/3/12 at 10:57am