Woofers getting workout, but no bass

Rumble filter
http://www.kabusa.com/rf1.htm

Thanks for all your replies. I do think it's worse at the beginning of an LP.

My floor is concrete, but the turntable is at the back of the room where there is bass buildup. I think my stand is fairly solid, and I'm using a Terrastone platform underneath my turntable. Coincidentally, I just received this yesterday - it replaced a wooden shelf. I can tap on the terrastone shelf fairly hard and there is (seemingly) no effect on the turntable. I had the rumble issue before changing the shelf.

Dlcockrum, I have the TTWeights peripheral ring, I'll try that and see what happens.

I have to imagine this is adversely affecting the sound of LP playback...

Tried the TTWeights peripheral ring and it didn't help.

I'd be pretty bummed if I have to replace my cartridge.

YEah, its rumble originating from the warp inherent in many records that is typically at highest magnitude at the beginning of the side/outer edge perhaps magnified by sonic feedback from vibrations.

A concrete floor is good. IS the table sitting on a solid foundation/stand upon the floor? If not, it should be. If it is sitting up high on a stand, try a lower platform perhaps?

If the table is sitting rock solid and you still have problems, a switchable subsonic fileter may be the only remedy, but if all else is well, then in most cases practically this is not needed.

If your woofers are moving with large excursions for reasons other than the signal from the record, then this is utilizing power to produce noise and the power is not then available for the actual signal/music.

BTW, some of this (woofer excursion due to rumble) is naturally inherent in record playback. If you have everything else set up well together and the records are not abnormally warped, then I would not worry about it.

Not familiar with your table, but another thing that can help is to have a tt platter that is large enough in diameter to support the record all the way to the outer rim properly. TAbles with smaller platters are generally more susceptible to this particular curse.

Also, if you have a dustcover, keep it down while playing. THat should help minimize the unwanted effect.

mapman, I experienced the same problem a while back and purchased rumble filters. It took care of some of the problem but not all. In my paticular case a change of cartridge did the trick- no rumble woofer movement now. I know this is not what you want to hear and may not be your issue but it is what it is. I will offer to let you try my filters to see if they work for you if you like- no charge of coarse. PM me with your address if you want to try them.