I was given a car audio system consisting of 2x12'' subs, 2x400W max amps and 2 6x9'' speakers. It is too loud for my ute so I've set it up as an e-kit amp (drums) in my garage.
It's currently operating on a 12v, 20A switchmode, but the switchmode is crerating crackle in the speakers.
I'm about to buy a new battery for the ute so I was thinking- should I hook up the system to my old car battery, and leave it trickle charging?
My concern is: will the trickle charger be damaged by overcurrent when starting the amp every day? It has a 1 farad cap connected across the supply also. And the amps have 40A fuses. I'd like to leave it on charge while playing as I dont think the battery will last more than an hour or so (it's 5 yrs old).
Is this a good idea? I figured I'd need a transformer nearly as bulky as the battery anyway, plus the old battery is free.