YMMV, but here are some links that, so far, are on the top of my list for future purchase dealing with dirty AC:
http://www.psaudio.com/ps/how-to/installing-a-dedicated-ac-line
http://www.cruzefirstaudio.com/maestro_outlet.htm
http://signalcable.com/magicextension.html
BTW, I've learned recently that some amps even require 20A lines. Good luck, let me know how it goes?

