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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: RE: Quite so posted by neobop on March 9, 2011 at 12:48:49:
You are right about the mechanical bending resonance of the cantilever being of primary concern in low-output moving coils. The electrical resonance does not come into play because it out in the stratosphere up around 1-MHz or higher. Ortofon did extensive research into the cantilever bending resonance using an accelerometer to excite the cantilever so that they knew exactly the phase and amplitude of the input signal. Ortofon's primary concern was finding the optimal amount of cantilever damping to form the best compromise between amplitude and phase response. Dynavector, on the other hand, attacked the problem from a different direction.
Dynavector decided to design a very stiff cantilever so that its bending resonance would be moved higher in frequency with the resulting phase shift out of the audible range. They experimented with very short cantilevers made from very stiff materials like ruby and diamond. They were successful in moving the cantilever resonance out to 50-kHz and beyond. My original Dynavector Ruby with its 2.5-mm oblique cut cantilever had a bending resonance close to 50-kHz. Their cartridge with the highest cantilever resonance frequency had a 1.3-mm short diamond cantilever that resonated at 100-kHz. However, there were other problems associated with such a short cantilever because it was so much shorter than the cutting head cantilever that it produced other types of scanning distortion. Of the original Dynavector cartridges, the 1.7-mm diamond cantilever model is the only one that survived and is still being produced today. It has a cantilever bending resonance of 80-kHz with basically no phase shift whatsoever, mechanical or electrical, within the audible range.
Best regards,
John Elison
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Follow Ups
- RE: Quite so - John Elison 16:30:25 03/09/11 (0)
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