Thanks for the info Mark.His amplifier is my custom DSP version of the SP2-8000HT. For those in North America, I generally recommend sticking to the 120V line and simply run a dedicated circuit. Depending on what else is in the system, mixing the 240V with 120V can create some headaches with hum or buzz, and it only takes 1 component to cause a big headache. The 2x4000W amp is designed and optimized for 120V operation. The 2x6,000W version is less sensitive to power line sag due to the more complex power supply, but it adds cost unnecessarily. I only have a few customers in the US with the 6,000W amplifiers for unique situations or desires, and I generally only recommend them for our international customers who need them where the power systems are 230-240V AC.