I'm having trouble w/ my setup, where the low end is ultra distorted past the point where its preference. Something must be blown out or bad somewhere in my system and I need to figure out how.   I have a pair of AKG K701 and Hifiman EF2. They sounded great for a while then I stopped using...

This will be my first headphone amp and I have a pair of AKG K702 I really like but have been grossly underutilizing unamped. Right now I'm using its stock cable but may very well eventually upgrade to ALO or the like.   I've narrowed my search down to Firestone Audio Fubar IV and they're...