My ATM 211s have been plugged in a live AC source since the summer with no issues. I've also left them plugged and unused for extended periods of time without issues. I suggest you contact Tom Tutay at:
Tom Tutay Transition Audio Design 24 Elm Avenue SE Fort Walton Beach, Florida 32548-5622 Phone-850-244-3041
BTW, I'm also using the ATM 211s to drive WP7s.
Good luck.
Tom Tutay Transition Audio Design 24 Elm Avenue SE Fort Walton Beach, Florida 32548-5622 Phone-850-244-3041
BTW, I'm also using the ATM 211s to drive WP7s.
Good luck.