Ok, that's what I thought, but the difference in output kinda scared me. I didn't think these subs would get that loud on 300 watts. I initially set the 4 channel normally when I was running 6x9s off the rear channels. I switched to the subs later on, without changing the amp settings, and was ok with the output. For kicks, I set the rear channels with a sub track today, hooked everything back up, and was shocked at the output. Figured I better make sure tuning that way was ok. Thanks for the input.