Music is not a Sine wave and constant. That's why it has merit. The point about recharging time is rarely discuss and that's why it DOESN'T work as well in certain situation and it's an important point. Point being your source will always be the alternator and if you going beyond it's capacity ALL the time then no amount of batteries or caps will work. What we have here is an extension of the capacity of the Alternator given the scenario of music reproduction which means the demand is not constant hence headroom.
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