Source - iPhone, PC, MacBook Air. Listen to - pretty much every music style, and some gaming. Prefer - rich warm sound, full bass (but not bloated) and good detail. I like a sound that's easy to listen to for hours and not fatiguing. I currently own QC35’s and HD215’s. I’ve tried the following, all without amps: PM3 - loved these! Good full spectrum, and sounded quite detailed. Made the QC35’s sound muddy in comparison. PM2 and HD700 - neither one sounded as detailed as the PM3?? Possibly due to not having an amp?