A "20 amp" plug won't give you more power than a 15 amp one. The power drawn depends on the load (your amp). A draw of 20 amps would mean 2300 watts. If your amp were only 50 percent efficient it would be putting out more than 1100 watts...continuously! Your equipment can't draw enough power to overheat a 15 amp plug.
Audiophiles like to use oversized wire so as to minimize voltage drop. The fact that such wire could carry high current (which is why most people use large wire) is irrelevant.
Audiophiles like to use oversized wire so as to minimize voltage drop. The fact that such wire could carry high current (which is why most people use large wire) is irrelevant.