Maybe someone can explain me: I want a good quality amp that I can also plug in my expensive sennheiser HD 650 headphones into. Interest= classical music/ I nearly decided on buying the Musical Fidelity XT100 amp (with XRayV8 CD player) BUT now I am told it has no headphone jack and needs a headphone amplifier which can cost me a further $500 !!! Now I am confused. I don't understand. I thought an integrated amplifier has a pre-amplifier that does the job of a headphone amp. Could someone explain me some of the basics of this? I looked up the Quad 99 power amp and couldn't see any headphone input there either. My very cheap Marantz SR-47 amp has one. Are there good quality amps that I can plug my headphones into?