Try placing the block on some isolation devices such as cones. If the block is sitting directly on the cabinet it will transfer vibrations to the table. Isolate the block from your cabinet as well as you can.
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Thanks Stanwal, I'll try that.
The reason I think the bass problem is within the TT system is that it's present even with the the headphones on and the speakers turned off. Perhaps need better way to drain vibration away from the platter and arm, but the Philips arm and platter are suspended together and separated from the plinth.
Wondering if there are ways to dampen resonant vibrations on the tonearm itself???
An old trick was to use SMALL amounts of something like BLUTAK. Can be placed between cartridge and head shell. In my former days as a dealer I was once sent a similar substance to try by an accessory co. Or on counter weight, this is my idea and I haven't tried it so you can blame me if it doesn't work. I use to use a 212 but it was too long ago to remember anything specific, it was a well respected unit in its day.
OK - I tried applying blutack in various places on the turntable and here is what I found:
-placed between the hard plastic feet and the underlying wooden block - bass was more pronounced, but not necessarily cleaner; some loss of air and spatial cues in the treble; "plastic" or rubbery sound to midrange - NOT HELPFUL
-very small amount placed in spots between plastic cartridge carrier and head shell where they clip together - cleaned up bass with very slight loss in dynamics - HELPFUL
-small strip placed between cartridge and plastic carrier before screwed together - at first - cleaned up bass, but some loss of air and space in the treble and more of that "plastic" sound; over time treble problems and midrange went away and bass remained tighter - HELPFUL (suggest blutack moved away from contact points between cartridge and carrier under pressure from screws and now acting as "glue" to provide better bond between surfaces)
-small dots placed on either side of counter weight - cleaned up bass a little bit with no other adverse effects - HELPFUL
-small dot placed on top of head shell - dulled sound - NOT HELPFUL
-small dot placed on center of tonearm - robbed bass and space from sound - NOT HELPFUL
I do not currently have the resources to invest in brass footers or other isolation devices for the TT base or the wooden block, but will investigate this in the future.
Thanks for your input.