I just picked up this amp for a great price, but dont know much about audio and would like to know if it will be enough to power my front and rears, NO subs at the moment. Amp I bought is: ALPINE MRP-F250 RMS Power (at 14.4V THD+N, 20Hz-20kHz) Per channel into 4 ohms: 40W x 4 (0.08% THD) Per channel...