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In Reply to: RE: It should be the same or close posted by richardl on January 05, 2017 at 12:32:26
Thanks. Do you think that might be caused by age of the cart (early 80s), perhaps suspension tightening up? It's got great specs and a berylium cantilever.
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You could send it to Soundsmith I suppose but, I would get an estimate first.
Not necessarily. It depends on the suspension design. As I pointed out in my post, at least 2 patents exist which specifically teach controlling lateral and vertical compliance values independently which frees the designer to adjust the VTF range without unduly compromising record wear and bandwidth. The lateral compliance indicates that the damping elastomer is likely fine. 7Hz is lower than ideal but shows that it hasn't hardened excessively (if at all). Commonly, it is suggested to aim for 8 to 10Hz, but at least 10Hz to 12Hz would be a better target particularly for the vertical compliance to achieve a more stable VTA/SRA.
Also, the specific resonance values need to be measured off an actual recording to determine the actual resonance frequency rather than making assumptions that the labelled frequency corresponds to the reproduced frequency (which ignores speed errors)
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
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