thanks for the comments,i read the center channel post about the long leads,will check that out before i try to tighten down the woofers a bit.it does happen during the lower bass freq.at least as low as the speaker can do,i did not have any bass adjustment turned up that high just a bit past the middle.and i just hooked up a rotel thx pre-amp maybe i can adjust the front by pass switch see if that helps.the speaker just started doing this the last 2-3 weeks even before i hooked up the pre-amp.will try these things and let you guys know how they work out,hopefully it its the leads or the woofer just a little loose.Thanks
