adk,
My receiver says i'm using zones 2&3. When I had the problem I did check that I wasn't running in Surround sound and made sure I ran in music mode. But, you may be right on the number of speakers playing....I did turn off the rest of the house and only ran the garage.....that's when the problem was extremely noticeable. I swithed my A/B switch to A&B but that had no effect.
I don't remember having the issue when more speakers were on.
Rickster,
My connections are good at the speakers but I didn't check at the A/B switch...I'll do that. The run is the longest to the garage....straight line it's 84 feet but that doesn't include vertical rises and drops, so I would estimate about 100feet. If I remember correctly, I purchased 10 ga wire. Thanks WR