A lot of the new integrated amps seperate their pre/power sections with external terminals. Nad and Marantz spring to mind. Would it be sensible to connect both the preouts of the stereo preamp and the preouts from an AV integrated into the power section using either a 2>1 interconnect or a splitter/combiner? I can't see how this would cause a problem but presumably there's a reason it hasn't been suggested before? It would provide a lot more options than the current Arcam/Musical Fidelity choices for fixed gain input.