I, too, have used my Spacedeck both with and without the plinth and found no audible difference in sound. My sons, and I, like the looks better without the plinth. My wife likes it better with the plinth. I will leave to your imagination how I have it set up....
Interesting the comment about the heavy kit. I do not use the foam mat as I find it too "fat". I have used a Mystic Mat to very good effect. Also, try without the foam mat and place a circle of heavy stock paper (like the thickness of a standard business tab folder) within the indented circle surrounding the spindle. I think that may be the very best choice.
Another tweak that seems to work well is to use #4 silk beading thread instead of the stock rubber platter/motor band. It is a real bitch to get it the right length and tension to achieve proper rotational speed, but provides some improvments in clarity. The change is subtle, though, and may not prove worthwhile unless you like to fiddle-fart around with these things! :-0
Interesting the comment about the heavy kit. I do not use the foam mat as I find it too "fat". I have used a Mystic Mat to very good effect. Also, try without the foam mat and place a circle of heavy stock paper (like the thickness of a standard business tab folder) within the indented circle surrounding the spindle. I think that may be the very best choice.
Another tweak that seems to work well is to use #4 silk beading thread instead of the stock rubber platter/motor band. It is a real bitch to get it the right length and tension to achieve proper rotational speed, but provides some improvments in clarity. The change is subtle, though, and may not prove worthwhile unless you like to fiddle-fart around with these things! :-0