So I gave it a try today! Plugged both amps into a power strip (pedalboard went into another wall socket), signal went out from my TC Flashback stereo outputs into my AC15 and Micro Terror, and...No noise! No phase issues! Haha It sounded pretty damn great, even though it was at bedroom levels. I really didn't expect it to work that easily. The power strip I used was a Tripp Lite Isobar surge protector, but I don't think that helped more than a power strip would have. My only question now is...can I count on this to behave the same in the future? I'm guessing it should behave the same the next time I play in the same bedroom, but if I take it out somewhere, it could possible behave differently? And how about phase issues, will these two amps play in phase all the time, or could this change too? Thanks again for all the help!