I've read a bit here about source volume and portable headphone amps. Some say 100% some say 75% and finally some say 50% and so on and on. I got a headphone amp (2 actually, a PA2V2 and a Headsix, to see which I liked more) for my i7 and I was wondering if anybody else is using an amp with...

About 48 hours ago I decided to get into portable audio. I have aways been into home audio, building tube amps and speakers, but have never had good tunes for the road. So I decided to get some gear. For the source I got a Cowon iAudio 7, for the portable headphone amp I got a PA2V2, and for...