Dave,
Try the Synergistic Research Tesla PowerCell. Prior to it I used dedicated circuits and high end power cords. I had tried all the same power conditioners you list, and concluded that power conditioners do more harm then good. Aside from what you might expect a power conditioner to do in the positive column, the PowerCell actually IMPROVES slam, with my whole system including my amps plugged in!
I love mine.
Try the Synergistic Research Tesla PowerCell. Prior to it I used dedicated circuits and high end power cords. I had tried all the same power conditioners you list, and concluded that power conditioners do more harm then good. Aside from what you might expect a power conditioner to do in the positive column, the PowerCell actually IMPROVES slam, with my whole system including my amps plugged in!
I love mine.