I have an Epic 80 7.1 system with the EP500. It is incredible sounding to say the least. One thing I have noticed, though, is that every so often if there is extreme lowend bass happening, the EP500 will vibrate so hard that the cone rattles against the enclosure. Is this normal? If I put in digital video essentials HDDVD and do the speaker test, I can repeat this every time.

I have all of my speakers set to small in my receiver so the sub is handling all low end. I've only heard this on two Bluray movies so far, so it's not a big issue, but it does concern me.

Does anyone have any ideas/suggestions?

Thanks

Mitsubishi 62" DLP Pioneer VSX-84TXSi SA 8300HD XBOX 360 Axiom Epic 80.500 7.1 Speakers