NAD owners: help with speaker selector problem

No. I am not reversing the set up. This speaker selector also has an A/B switch to switch between two amps/receivers. Any ideas? Anyone???

Dave are you trying to use the speaker selector switch *backwards*? Selector switches are normally connected with a single source component (receiver) as the input, & then you'll have two or three pairs or speakers on the switched output sides.
It sounds here like you are trying to drive a single pair of speakers from two separate receivers? You can probably do that too, but everything will have to be setup backwards. By that, I mean the speakers would have to be wired to the input side of the switcher. Then the two receivers would be wired to the output sides (A & B respectively) of the switcher. To play receiver A you switch to A & to play receiver B you switch to B. As a precaution you should probably not simultaneously have both receivers powered up & driving their outputs at a high level, perhaps not powered up at all when switching between them. If the switcher contacts don't break before make then you could have some serious smoke.