Reference Unfortunately, not even remotely

The HD 650 even on high-end headphone amplifiers as Musical Fidelity and Lehmann Black Cube Linear (top unit for 720, -), which can power these headphones effortlessly with its 300ohm, is a total disappointment. Juice and powerless. Boring. To convey without musical gameplay and without enthusiasm. Quite different to the old HD 485. As correctly it is pure joy. And going even super good on my Cowon iAudio S9.

The HD 650 is returned to sender.