Hi,
I'm very sorry to hear about your difficulties. I currently own the ATC-1 and used to own an ATM-1 power amp and think that they are fabulous sounding components. The first thing that springs to mind in your case is maybe borrowing more efficient speakers to do a comparison. You may be hearing the Air Tight amp clipping, or at least straining to cope with the demands of your speakers. I don't know the specs of the Avalons, but something tells me they're not the easiest speakers in the world to drive. Give another pair a try, but above all, don't panic and do something rash. As you've said, you've already lost a fortune, work through this and you may not lose anything else. I'm sure others will have even better advice, so hang in there.
I'm very sorry to hear about your difficulties. I currently own the ATC-1 and used to own an ATM-1 power amp and think that they are fabulous sounding components. The first thing that springs to mind in your case is maybe borrowing more efficient speakers to do a comparison. You may be hearing the Air Tight amp clipping, or at least straining to cope with the demands of your speakers. I don't know the specs of the Avalons, but something tells me they're not the easiest speakers in the world to drive. Give another pair a try, but above all, don't panic and do something rash. As you've said, you've already lost a fortune, work through this and you may not lose anything else. I'm sure others will have even better advice, so hang in there.