I agree that sub freq are not locatable so it would seem that one output might work. But if there are two identical "low" signals in the outputs or as suggested, they are kept different for stereo, wouldn't it still be true that half of the voltage output (spl) is missing if only one rca is used? Hence a stereo to mono or Y adapter might be advised? To those who say that you'll lose stereo info I have to think that the total effect is there this way anyway but as mono. Which if below about 80 is how we'd perceive it anyway. If you hear differences from L to R its prob above 80 in your mains.
