There are "step-ups" on the market that could be used to solve my problem. At the input they accept variable voltages and at the output they maintain a constant voltage even with a fluctuating input voltage. The model I chose is this:
And now the electronics.... Class D amplifiers are very compact and have an excellent performance compared to those in class A / AB. The choice fell on this model that uses the STMicroelectronicsTDA7498 in class D available on EBAY for just over thirty euros. It is specifically designed to be coupled to a soobwoofer and can be powered up to 32V/6A.
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