Switching between amp and headunit outputs

ACM

Member
Looking to get an amp and subwoofer added to our ice system, in past years I've had big installs and ended up with a flat battery many times running the amps without the car running.

This got me thinking, is there a way to switch between an amped output and the headunit output for the speakers? I'd imagined a 8 channel relay linked to a single switch, but I was hoping someone will have done this before in a much simpler way
 
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