Overall power does not seem to reach the displayed wattage of 4000, however, it does stand up to reliability and perfoomance wise when considering nio overheating or random shut off as othe amplifiers can and may normally do! This amp was run on two 15' with peaks of 3000 watts each and a continuous of 750 each, ultimately blowing boh speakers in series, so one may say that the amplifier may push it true 4000 watts to have blown the speakers but according to more name brand amps such as kenwood, alpine and JL it does not produce a loud enough sound to be comparable in any form or fashion.