Ok , have a NAD stereo amp, had purchased a NAD AV AMP, turned out it was faulty but didnt like the way it handled the bi-amping anyhow, so blessing in disguise. Once you bi-amp the two NAD's (pre-out to main in) it left the stereo amp rendered useless as you HAD to put the cd player through the AV AMP, not a good solution when I want better stereo for cd player and the reason for using two amps in the first place. Is there any amps out there that have a different feature for this? someone mentioned to me Denon and maybe Arcam have a switch for this? Thanks in advance.