I am using a Sampson SX2800 for my two passive subwoofers and noticed that it also uses a 15A breaker. There was also a note in the manual: NOTE: If you are operating the SX amplifier at high power levels for long durations in fixed installations,
you may consider switching the operating voltage to 220 volts. A licensed and insured electrician and/or
technician should perform this modification.

I didn't know I could switch my power circuit over to 220V and use the same 120V amplifier in a 220V circuit. Is that possible?