[Christ]

Well, that's still counted as an audio component... and if your head unit is 10 watts per channel, unless you're using a line out (non-pre-amped) it's 210 W max output to whatever speakers that amp is running. *the term is daisy chained*

If you have an amp powering another amp, you add up the wattage of the two amps. Most head units are amplified, so you add the wattage of the head unit to the wattage of the amp when considering your total output.