I've got the Bronze BX surround system (sans the subwoofer) running a 5.0 surround stage driven by a Denon AVR-2310, and I've started to notice a very nasty rattle inside my BX2 speakers whenever I have bass low & loud enough. I first noticed it watching Close Encounters of the Third Kind, about 21mins in during the scene when Dreyfuss's character first encounters the UFOs. There's a very deep rumble through that scene and all through it there's a loud persistent rattle coming from both front stereo speakers (my other speakers sound fine). At first I thought it was something loose in my room (a bookshelf maybe), but no it's definitely coming from inside my BX2s. For the most part bass is ok, it's only when it gets really low. Another example that causes rattle is the Windows 7 Speaker Test (via the control panel), which causes the rattle during the SUB test. It seems to me that my Right BX2 is worse than my Left BX2, rattling at lower volumes. Is this a fault with my speakers, or could it be that I'm simply driving my stereos too low because it's a 5.0 set up without the woofer to take care of the lowest frequencies? I basically just need to confirm that you can drive these speakers too low or whether they are supposed to work flawlessly across the entire frequency range that they can actually produce.