amp working harder at lower wattage and higher ohms?

[Falcons 5,000+ posts]

correct me if im wrong, but if i use the formula (sqrt(watts * ohms)) = voltage to get the voltage i need to set my amp at. now my rf 1500 amp is rated at 1813 rms on the birthsheet. so if i put that into the formula it equals out to 42.57 ac volts. however, my sub is dual 4 ohm so i can only run it on 1300 watts at 2 ohms. put that into the formula and i get upwards of 51 ac volts. so the question im really asking is it easier on your amp to wire down to lower ohms if it is efficient enough to do so?

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[vaiboy 10+ year member]

Wiring to a lower impedance increases the current passing through the amp. For example your amplifier at 1Ω would be seeing 42.57 amps or 25.5 amps at 2Ω. The voltage is higher at 2Ω but the increased amperage at 1Ω is harder on the parts inside your amp and your charging system.