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Hansshow premium audio upgrade for 2023 M3SR

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I think they are using a Rockville SS10P which also says 12V (not the Alpine), so I don’t know how they are using it.
Normal cars are lead acid or LiFePO4 for the 12v system which tops out around 14.5-15v, so most 12v electronics should work just fine up to 15v, and most amplifiers have their power rating done at 14.4v. Some amplifiers may have over-voltage protection which could kick in anywhere above 15v, there's a good chance most amps would be capable of 16v but without them saying so it's not a risk I'm willing to take, and not one I would recommend anyone else take either.