Batteries to 2 large pure sine wave power inverters ..!
https://theinverterstore.com/product/6000-watt-pure-sine-inverter-charger-48-vdc-to-120-vac/
Regards
Technical:
Use the 4 ohm tap , there will be less distortion from mismatch vs the 8 ohm tap ..!
Subjective : The 8 ohm tap high voltage will control the woofers better and if you don't drive or play loudly may subjectively sound better to you.. If you do like to drive the Amplifier the 4...
Never heard measured good sound bad with electronics , usually they sound as they measure.
Loudspeakers are a bit different in a few situations but mostly the same measurement vs sound metrics apply.
Edit: Full bench measurements not the hand pick what looks best to print deals ..
Regards