Ozfly; I think you're headed in the right direction. At one time I needed a longer power cord for my amp and having nothing else, I plugged it into a cheap 20 ft. 12 ga. hardware grade extension cord, and it absolutely KILLED music quality-- it wasn't even listenable. I ended up special ordering a 14 ft. Syn Res Master Coupler, and with it music returned to wonderful.
I know this is not your situation, but it was my experience with a cheap extension cord. I believe Cardas makes a high quality extension cord with several outlets. Good Luck. Craig