Thanks for your response. I've seen WP7s driven by 18WPC Lamm SET gear and sounded wonderful. Are the ATM211s less capable of handling difficult loads than the Lamm ML2s?
The Air Tights probably don't have the most robust power supplies. However, their transformers are made by Tamura -- one of the best in the industry. It probably has more to do with the design topology. I've heard good things about the darTZeels but they're out of my price range. Thanks for the feedback.
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