To add, after the dual bank you will want a deep cycle battery for the music setup with a large Ah rating. Deep cycles [think RV/golf cart battery] are designed for many, long discharges whereas your cranking is only designed for the initial pull when starting and subsequently recharged when running. You won't see a very long life running a cranking battery down to run your tunes. With a dual bank you'll have your selector for the cranking battery or the deep cycle to run when parked, but can set to 1 & 2 when engine running to charge both.
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