I finally got around to wiring some dedicated outlets above the rack. I'll now have a dedicated 120v-20a duplex outlet for rack electronics, and a 240v-20a duplex outlet for my subwoofer amplifiers - Crown CE4000s. Next up I need to recalibrate, as the amplifiers now are running with their fullest gain potential, 3600 watts into 4 ohms. each. Progress!