I use my AKG K-501's with a Yamaha RX-V2500 receiver that I purchased the other day, and before then with an old Yamaha DSP-A1000 amplifier. One thing I've noticed is that on my new receiver, I must raise the volume quite high on the scale. I should mention that in both those amplifiers, the headphone output is independently powered and tapped shortly after the volume control, not tapped from the power amp as some claim most receivers do. The headphone amplifier circuit in both the DSP-A1000 and RX-V2500 are quite similar in design and built around the same basic op-amp, so there seems to be nothing obviously "cheaper" about the new one. So, the question is: How does the headphone amps in Yamaha mid-range amplifiers/receivers stand up to reasonably priced standalone headphone amps, and would it be worth getting one? If so, what would you recommend for the AKG K-501?