Woofers getting workout, but no bass

Check phase: you mean speaker phase? This is correct.

DC at amp output: can you explain this?

I probably should have mentioned that I'm using a Triplanar/Dynavector XV-1s.

Read up on the rumble and it does describe my situation. How normal is this? Is there something that can be done or does one just live with it?

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.

Clcockrum: The ring I have is fairly light and isn't much help with most warped LPs. I used to own a VPI table and their peripheral ring worked wonders for warped records.

The TTWeights ring does nothing for my rumble problem, but if I recall there were more than 1 option of rings at TTWeights and I think I got the lightest one.

Well so far I've reversed phase, add damping fluid to my Triplanar arm, double checked level, tried raising lowering VTA, all to no avail.

Kevin at KAB suggested that his filter would be a bandaid and that damping should be the real solution, but unfortunately that didn't work.

Apart from trying a filter, I'm left with the notion of replacing the table, arm and/or cartridge, all very painful thoughts. :-(

Thanks, Doug. I did remove the damping fluid as I didn't like what it did to the sound (I've now removed the damping trough as well).

I wish I knew whether the Doshi worked better in this regard, but it was only recently that I removed the lower grills; I have no idea how long this has been going on.

I did try an old Project Tube Box SE II phono stage that I still have - it has a subsonic filter (18hz with 24db slope) and that worked (not that I would use it as my phono stage).

The Wikipedia seems to indicate that rumble affects the sound even when not audible.

"Even when not audible, rumble can cause intermodulation, modulating the amplitude of other frequencies. The ‘unweighted’ response curve is intended for use in assessing the level of inaudible rumble with such intermodulation in mind"

Also, one has to wonder how a speaker can produce accurate bass when the woofers are pumping violently.

That being said, I've given up on doing anything about it for the time being.

Man, sometimes vinyl is a real PITA.