Just want to let you guys know that I am very impressed and happy with this DAC/Headphones amp. It's sound is very revealing and not a hint of harshness like some modern DACs. The headphones out has plenty of kick to drive my Beyer T1 (600 Ohms). I am pairing it with my new Sony MDR-7520 Professional headphones. Match made in heaven for a mobile DAC. Did I mention it is USB Bus Powered? Yeah, no power supply needed.