Subwoofer "Thumping"

Do you have a lot of movement on your main speakers mid and/or bass drivers at the same time?

When I play records that are dirty I get quite a bit of driver flutter. Clean the record and it goes away.

BB

My guess is that you need a way to remove the lowest frequencies (below approx. 15 Hz), as is done automaticaly by my HSU Research Electronic Crossover. There is a lot of low frequency garbage on some vinyl that an unfiltered sub will reproduce in all its "glory." I hope someone more knowledgable will address this issue here. Good luck, Dave

Yes, it is likely subsonic noise that can be filtered using a subsonic filter.

Garbage on vinyl! Can't be true, can it?

Bob P.