Its been a while since I've been here and I will be donating to the cause. First wow I just love these speakers since 2006. My first pre-amp was a Chiro something or another that made nice sound but no base. Now that I have a Nad, I have perhaps less sound but woooo, allot more bass. A Hafler 500 remains the muscle. The darn tweeters stopped working again. Last time it happened 2009 I had audiotronics of Ch. Hill NJ replace a transister or something another on each network. Recently the tweeters stopped working during a 2 hour mid volume run. No sharp noises or anything they just quit. I'm hoping before I run them back for repair I can get some advice from the community as to what I should suggest the technician look deeper into to find the cause. By the way the Hey Mickie song? The bass in that tune goes places like no other.