In case anyone is still looking through this thread I finally have an update. After removing the board from the speaker and contacting ML customer service I found out that it was the amp that had burned up and needed replaced. I talked it over and ML sent me the replacement amp and it arrived just after the holidays. On a side note, and I'm sure most of you already know, let me say that Martin Logan's customer service is second to none. I spoke with Josh who was knowledgeable, courteous and professional. I really mean second to none. After receiving the amp it took me several days to actually getting it switched out but I finally got it 2 nights ago. Unfortunately I'm still not getting the Grotto i to reproduce a signal and now when I power it on I get a really weird squeaking/screeching sound. It's definitely coming from the driver, which by the way is getting power now, or at least the cone is stiffening up when powered on unlike before the amp switch when it did nothing. The noise sort of sounds like an old sci-fi movie sound effect maybe. It sounds electrical and it pulses on and off with rising pitch(frequency). It's not too too loud and it doesn't matter where the level control is set. Also it produces the same sound when hooked to my receiver as it does when it's not hooked to the receiver. Also it pulses with no common frequency. Any ideas anyone? I'll be contacting ML's customer service today but if anyone here has any suggestions I'm all ears. Thanks in advance.