Here’s MY take.... I have a Superscoutmaster/rim drive, Classic platter, 3D arm. I found that spikes under the turntable made a very large difference for better. I put the motors however, on soft feet so that as the driving disc rotates, any out-of-roundness with the platter or the driving disc, is absorbed by the motor assembly. This is easily demonstrated by lightly touching the space between the motor assembly and turntable itself...I can feel the motor assembly moving back and forth. When I also put cones under the motors, there is more noise. On another point....in MY system, cones, rods, marshmallows, upgraded power cord, etc., have any effect at all under my SDS.
So Long It's Been Good To Know Ya
I just saw an ad for a VPI controller called an ADS. I went to VPI's website and discovered that no SDS was listed.....I suppose the ADS is to take the place of the SDS.