Thanks, about the extension cord, I could have picked one up like you specified at least in a couple places I can think of, however I ordered one from Panamax that's just like the cord that came with that unit...big amd heavy. The cord itself is 10'...just the right length for getting the power source from that 15 amp outlet. The funny thing though it's grey, not black like what came with the unit. I would have liked to have white, but oh well!Sounds like a good setup to me.
You should have plenty of current and if I'm right about how those high current outlets work, your power amp and powered subs will have a surge protected but otherwise unfiltered and therefore lower impedance connection. And since I have yet to see a power amp care about any realistic amount of power noise, the lack of filtration won't be an issue.
For the extension cord, a 15 amp cord that's 14 gauge (AWG) or less is best.
15 Amp 14AWG Extension Cord, 10 FT, GREY