I have a pair of Sennheiser HD 598s, and a Fiio E7.
A lot of people said they noticed a HUGE difference when they got a Fiio E7. To be honest, I didn't notice much difference at all. I think the amp works fine, since when I change the bass booster, I can hear a difference, but other people said the difference was HUGE. I don't even have a sound card. Is there any way to test my headphones or amp? When I got my headphones, I boosted the sound to the max, just to see how loud they can get, could this have damaged them?