if u c the amp rationg/specs, there is a thing called THD-total harmonic distortion.. normally they r rated below 0.001%.. i'm reffering to those branded stuffs larhh.. not those few hundred bucks stuffs..

the "pss" sound is simplified to b easy understand yet behind there r still lots of noise to be heard if the THD is high..

all i can say is that the amp performs better than the 1 from HU and louder (as in powerful) than the HU..