Whew! I was hoping for a good answer. Downside of the inverter problem, I won't have an extension cord for probably the next week (ugh snow, work, outside storage sheds, and daylight for only the hours I'm at work ). So, I'll wait a week, try it on the weekend when I actually don't have work, and will update this thread on the results.Many people have had success with ground loop isolators. I've only seen a very few complain about it degrading the audio, so your chances are good that it will work without making the audio muddy.