Tom,
I posted, on a separate thread, the exact thing you're asking. We had a power outage this past summer. I could see my 120 gallon aquarium was not going to do well (stocked with fancy goldfish from Dandy Orandas--right in your neck of the woods Tom). So off I went to Menards very early Saturday. While I could have gotten by with a very small generator, all they had left was a nearly 2000 watt Generac. Later that evening, via a single 12g extension cord direct to my second system, I was floored by how good that system sounded. I listened all that evening for hours amazed by what I was hearing. I can only surmise it was the effect of clean power. It amazed me.