Alright... got a serious issue here. I recently bought a 2x12 and am using it with my SWR SM-400S. The cab is 4 ohms. I was using my amp with a 4 ohm 2x10, using one side of the amp... which should produce 150 watts. When I got my new 2x12, I used the bridged output... which is supposed to deliver 550watts into 4 ohms. I cannot tell any difference between the two... even when switching from using one side to using the bridged output. I'm starting to think something is seriously wrong with my bridged output. Oh, the 2x10 is a 4ohm Nemesis rated for 225 watts, and the 2x12 is a 4 ohm SWR Bigfoot 2x12 rated for I think 500 or 550 watts.