Hi Nvp,
Sure, if the cd player or dac has a volume control, the preamp can be bypassed.
I see, but the A-65 is about twice the price of the A-46. 11k for the A-65 vs. around 6k for the A-46. In Japanese Yen. Whether you wanna buy from Japan is up to you. The prices are much lower. Anyway, if one is unable to afford the A-65, why not the A-46? Realistically, the A-46 is a great amp, and I'd say it will please the vast majority of audiophiles out there.