Plinth mass vs. Foundation mass

Isn't there a correlation between high mass and acoustic breakthrough, or resonance, at the low frequencies. Wouldn't that tend to thicken the sound?

A compact method of isolating is to use a wall-mount platform. In this way, floor-borne vibrations are mostly eliminated. The use of an isolation platform, such as a sand box, or other will provide mass. The secondary platform can then be isolated from the wall-mount platform, by the use of sorbothane pads, or other products available. Experimenting with different means to achieve your goal can be enjoyable, and not necessarily expensive, if you are willing and capable of some DIY.

Best of luck,
Dan

The overriding factor here is the construction of your home/room. Concrete slab/ floor joists. This is THE overriding factor to consider any options upstream.

These factors will help you to determine what type of tt suspension if any and so on. Start at the beginning...

Slaw is correct.

Concrete slabs are the best place to start for isolation.

Elevated joist floors tend to be vulnerable to many vibrations and resonances. IT will depend upon construction quality to a large extent. Generally, a higher level will be more subject to these factors than a lower one in any particular building/home.

The other big mistake people make is placing a table at the top of a tall cabinet or stand. Elevation above the floor is generally the enemy of turntables in that external vibrations via the floor are amplified at greater height requiring more cost and work to isolate well. Keeping it low to the ground is best.

I am very fortunate that for the first time ever, in my current home (moved in in 1998) I was able to place my system in a basement level directly on the concrete foundation. That makes all the difference! This is the first time that I have had a near perfectly isolated table and the sonic benefits are clearly evident compared to all homes prior. It is truly a vinyl lover's dream situation that can be hard to replicate otherwise.

The coupling between the platter and the tonearm must be exact. If the platter is moving with respect to the arm, the cartridge will interpret that as a signal and a coloration is thus introduced.

Thus the plinth should be utterly rigid and devoid of vibration. Mass is good but its better if its non-resonant, so long as rigid coupling between the elements is maintained.

However the above requirements are met is not so important as the fact that they are indeed met.