Quote Originally Posted by TechMouse View Post
We run in stereo at Filth, as far as I'm aware.

One time Dom accidentally wired up the rear speakers the wrong way round and if you stood in the middle of the room it played all kinds of funny tricks on your mind.
Sounds like he had them out of phase. If the speakers are out of phase frequencies get cancelled out and it sounds weird.

Nearly all PA's run in mono to avoid phase issues, and because it makes the most efficient use of amps. You get the most power out of an amp by bridging it - combining the stereo channels of the amp into one output thus massively increasing the power.