I am using this amp in a portable ammo box system with PYLE 4" marine speakers (50W RMS?) , which are powered by 2 18650 batteries in parallel 3.7V Full volume and Pyles distortion, that's a groovy job 5 watts Update: 2x18650 in parallel gave long runtime but don't accidentally mix up one of the batteries that has the batteries and the amp burned up As I said, no more than 5 V. The LED still works.
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