Amp Power Source

Demonic said

Many aftermarket amps have a power relay built in, with a switch wire that can be wired to the head unit. Yours doesn't have that?

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It does. It also has a large power wire straight to the battery. It's a Blaupunkt thb210A powered subwoofer. I am also getting ready to add a smaller Kicker amp for the door speakers. I was taking for granted using relays.