I bought a Pioneer turntable on eBay recently so I could listen to some old albums again. I have noticed, however, during some quiet passages, that I can hear some turntable rumble. I think my problem is twofold - one, this turntable was made back in the '70's and isn't that high-dollar of a turntable, so it probably does generate more rumble that a really good turntable would. Second, I am using a subwoofer, which probably reproduces that low rumble pretty well. It probably wasn't a problem back in the 70's, since subwoofers weren't used and most speakers probably didn't go that low, but it is a problem for me now. The question is: how can I minimize this? Is there a different mat that I should use instead of the hard rubber OEM turntable mat, or do I need some kind of isolators under the turntable feet, or what? Any suggestions would be appreciated.