Bought this AMP to power my HD650 and to enable me to dock my E7 which I had prior to purchasing this. It provides plenty of power for HD650, and sounds very good. Bass seems to be improved a lot and soundstage has improved slightly.   For a budget amp to power high impedance cans, I recommend it.   E7 works very well with the E09K   note: If you have an E7 and are thinking of purchasing this, buy NEW. The E09K's manufactured before October 2012 do not support the E7 (there is a problem with hissing). This doesn't apply to the E07K.  ...