Portable Power for SamplePad and SampleRack

I plan on busking with my Alesis sample pad 4 and Alesis sample rack n the next few days, i have bought a MAK 15" woofer 1200 watt portable pa speaker and am now trying to figure out a way to power my Alesis products! Is it possible to power them both through the speaker? Or maybe usb to usb from pad to rack and then another power suply? If so what form of battery will i need to power both the pad and rack outside?
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