And that's why I bought one.Independent Test Results: Mechanical Energy Tests of the DL-103 with The Cap and without. The results were striking.
Putting a Cap on a Denon DL-103
"we can see that the magnitude of accelerometer's own resonance is a lot lower with a "Cap". It seems that the increase in rigidity has more than halved the high frequency energy transmitted into the headshell."
"Just like with the measurements, the improvements weren't subtle. I was especially impressed by the change in the stereo scene. It became slightly wider and gained substantial depth. Subjectively, linearity improved. Sibilance, which is a known problem with a DL-103/Jelco combo, became a lot more manageable — the 4 kHz peak seems to excite the bearing resonances a lot less than the 6 kHz peak. I noticed no negative effects of "capping" a Denon."