High end audio alternator

Make sure you use the correct gauge cable for both positive AND negative from the alternator, feed your amps through relays hooked directly to a 12V+ distribution lug that doesn't go through any bulkhead connector, and use a big, AGM battery, which acts like a massive capacitor to power through high current draw bass hits.

The Odyssey battery I'm using has a 5000 amp dead short rating. It will heat a short-circuited wrist watch to 400 degrees in a fraction of a second....really.