Not high powered, but I do have a system. Just a Infinity 4-Channel Amplifier (111 watts RMS at 4 ohms) powering my 4 pioneer door speakers and a single 10" sub. Nothing fancy.
I used to burn up an alternator about once or twice a year in my Escort as a result of car audio. Maybe you need a high current alternator, or maybe a capacitor ahead of your amp?
'98 SVT Red/midnight blue - a few mods
E0 wheels for sale - PM me