Just be aware that the HD800 is a lean sounding headphone and the BHA-1 is a lean sounding amp. I have both and MUCH prefer feeding the HD800 with a vintage receiver (Pioneer, Marantz, Yamaha, etc) with higher output impedance. Everything goes half an octave deeper in sound. Richer, fuller. The foundation is solid and feels more anchored. Gravity is lower, mass is higher.