I cant ever seem to figure amps and wiring out. I thought i understood but may have confussed myself.

Ok If u have 2 dual 4ohm subs and your wiring up to a mono amp would wiring it to 1 ohm load be the most efficient or 4 ohms?

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Next same subs. Rated for 400 watts RMS each. Would a 500 mono amp be enough? Or would u want to run an 800 or more?