Good amp for the money, the #s are probably way off, the 400 RMS at 4 ohms/channel is probably more like 280, the 650 RMS at 2 ohms/channel is probably more like 400, and I'm not sure if I did something wrong today but I wired my 4 Infinity 1030w's to this amp at 4 ohms bridged for 1600 watts max output and now the remote bass knob doesnt make any difference in sound, it worked fine when i ran the subs 2 ohms/channel