Important question about amp

About how loud is the 800w amp? I mean is it the smallest amp w you can get or is it one of the biggest or what? Sorry i just bought my car and i know nothing about systems.

Also how do i know how big the speaker is? It doesnt say anywhere on it it just says kenwood.

Amps vary from brand to brand, so just saying some generic 800w amp tells me nothing. It also depends on what impendence your running it at, if that is the RMS or peak, etc.

About the speaker size...you could always uh...measure it? Or look up the model number online.