Got'm wired up, tried them both out of phase and in phase, didn't seem to make a huge difference, but all I did was run some test tones from the main amp. Gonna order two more for the other couch as well as a sub amp. I really wanted to order a dedicated amp and kept talking my self out of it for various reasons, BUT I finally came up with a great reason to go ahead and buy it....Both receivers are Onkyos...what does that mean...trying to do anything on one, makes the other do the same thing, sometimes backwards even (ie power is a toggle, so turn one on and the other turns off). I swear, that couch did NOT want these things though. I wanted to put machine screws with lock nuts on to really hold them in place, well, the drill battery just about died, one drill bit is now a permanent piece of the couch (I've never had that happen before, it's just plain stuck, for the life of me I can't get it out), had a hell of a time finding bolts small enough to fit though the holes in the auras but more then 3 inches long, then I couldn't drill though all the wood for various reasons. So I decided to use screws, snapped one of the heads off etc etc etc... Well there in now, like it or not, and in a couple of days, the other couch is getting them too. Well, off to try them out!