I totally second Kattefjaes opinion about looking for upgrades to an HD650. As a person that has spent a few $$$ trying to find something that upgrades my music from my HD650M, and lots of $$$ later I still prefer the HD650M. Now I know what others tried to warn me about (and I didn't listen), Once you have an HD650M with proper amplification (I use a Schiit Jotumheim, Valhalla 2, and Emotiva BASX A-100), it will take a big $$$ jump to get to something next level. So I am selling everything besides the gear mentioned above and saving my money for what I now consider my "End Game" rig. STAX L700 + SRM-353X. Until I can get those, My Current amps + HD650M will do.