I was also looking at this amp and some others. Some questions on the specs that maybe someone knows? 1. Whats the 4ohm rating? All channels driven. 2. Is the power supply 400W? I also looked at outlaw and used sherwood. Outlaw 7100: 7x100(8ohm), 7x165 (4ohm), 51 lbs, $900 Sherwood...