Soundhound, haven't noticed any problems but HAVE worried about the very issues you raise with the Y-cables.

BTW, all my equipment is in a compact custom cabinet so no interconnect exceeds 3' except for the component video output from the 950 to the television.

Once I've settled in with my current interconnect system, I'm inclined instead of your 10K ohm (I assume 1/2 watt would be adequate?) solution to add a high quality DPDT toggle switch to my existing home-made control box which routes amplifier signal to three different listening areas. What are your thoughts on that alternative?