this is true and i was about to add. the HPA 5000 and HE-6 combo is very good. and the HE-6 is the better headphone, tonally, and transparently. despite only having 5W, the HPA 5000 has no trouble with HE-6, it doesn't have the headroom a speaker amp will, but its a good pairing. on other amps such as the WA5, the HE-6 also outperforms the HE-560.