...and oh, uh, er, I forgot to mention...(gulp)
Guys. As happy as I am (I AM!!), there was one glitch in the setup maybe you have an insight on. When I first brought the speaker to life from the LFE, set it on auto, sub volume on 1/3, it didn't come on at the volume I had everything set at. I slowly increased the receiver volume, leaving the sub at 1/3, until it fired up...then, perhaps 4 or 5 seconds after coming to life there was a loud ripping sound. Yeah, it did NOT sound good at all. I suppose the noise lasted mebbe 1/4 second. It was, wildly guessing here, at about 200hz, and reference level loud (much louder than everything was set at). All seems to be functioning now as it should. We actually looked at the driver to see if something ripped, but all looks normal from outside. It performs great. The other speakers seem okay.
Any ideas? Cosmic rays? Screaming Yellow Zonkers? Help.