@enginerd1960 Those mats desidned to be placed directly on the platter, why do you need your rubber mat in between? Micro Seiki CU-180 and CU-500 fits the platter of SP-10 series like it was designed for Technics, here is a picture of my CU-500 on SP-10mkII.
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I use the technique of constrained layer dampening . I look at a TT mat as doing two jobs . Isolating the platter form motor and external vibration & isolating the stylus from reflected energy coming back to itself . The Boston material choice of pure graphite is well suited for this task . The SP10MK2 is a little lighter on the platter then the MK3 and felt it could use more mass . As for the ERSA mat it made sense to me . |
enginedr, I am inclined to go along with Chakster; I would dump the rubber mat. But you have the luxury of choice and experimentation. Try it with vs without the rubber. Don't forget to change VTA accordingly. I would be curious to know how that turns out. I am not sure laying a rubber mat on top of a platter meets the true definition of CLD. For CLD, I think disparate layers need to be held together by a force greater than gravity. On the other hand, it's not hard to imagine that the floppy rubber on top of the metal does do something, for better or worse. I keep the original rubber mat for my SP10 Mk3 just because it's correct and original to the TT, but I wouldn't think of actually using it. |
From Wikipedia Constrained-layer damping is a mechanical engineering technique for suppression of vibration. Typically a viscoelastic or other damping material, is sandwiched between two sheets of stiff materials that lack sufficient damping by themselves. The ending result is, any vibration made on either side of the constraining materials (the two stiffer materials on the sides) are trapped and evidently dissipated in the viscoelastic or middle layer.Enter your text .... The mat stack is clamped with a Michell record clamp . The Boston Mat 2 is stiff . As for VTA I made a on the fly VTA adjuster for my Ortofon arm from a helicoid lens focus ring . Thank you for you feedback |
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