Scott - First, thanks for the videos, they are very helpful. As for your questions, I bought this mainly to use at home with a Roland Discover5 I recently picked up. Since I have a Bose Compact, I don't forsee the PA50 replacing it. But it could easily be used as a decent backup. It can be linked to another amp and used in stereo, as you said. It also has a subwoofer out; a great accessory. I have an EV SXb120 powered sub and I think the two units would be an excellent small crowd setup