So, hypothetically, how would I power a Soundfield SPS200 in the field?

[powermonkey]

I *might* be due some tax monies, and I'm contemplating the possibility of maybe getting myself a Soundfield SPS200. Possibly along with an SMP200 gain-matched preamp, as below:

https://www.studiospares.com/Microphones/Mics-Broadcast/Soundfield-SPS200-Bundle-Kit-4_474110.htm

My question, though, is how I would go about reliably powering these along with an Edirol R44 in the field.

Any thoughts? Cheers all.