I would say, the answer to that is "no". Not that you cannot do that, but that it will not sound correctly. You are not bi-amping a set of speakers, dedicating a separate amp to say the tweeter or woofer... you could, however, if you cannot switch your amps into a mono-mode, run both channels into a single speaker. Not the best solution, which would be mono-blocs, but workable. The real issue with what you are describing is that different amps take a different amount of time to process data. While this is normally incredibly quick, you will probably experience a feedback, or echo affect.