I brought my Bp30's to the store I purchased them from three years ago after noticing their sound wasn't quite right after listening to some of my cd's. While listening to music I got up went close to each side of each speaker and found that sound was coming from only one tweeter from each speaker, the other two were totaly silent. The people at the store informed me later that all four tweeters had gone bad and that they didn't know what could have possibly gone wrong for this to happen; they'll be replacing them under warranty. Would anyone here at the Forum give me some idea as to what could have happen to my speakers? My receiver is a Pionner VSX-D608 Dolby Digital and DTS decoder unit and is rated at 100 watts per channel, I had my speakers biwired. I live in central Florida; could lighning cause a surge to travel thru speaker wires and damage speakers?, or perhaps my receiver has an electrical problem?, By the way they told me nothing was wrong with the crossover networks in the speakers. Thank you all very much for your help.