Vot you should know this stuff!
House AC sockets are 120V 60Hz, say into a 4Ohm sub… that’s 30Amps… about 3600Watts. Most subs don’t like that :lol
The caps in an amp are for the power supply.
I dont have much time to go into why audio is AC, I actually have a lot to do today at work. Google it or better yet take a 9V battery and connect a speaker to it :lol