Quote:
Originally Posted by Audiophilehi
Wow! Outstanding! Very much appreciated!  |
The caveat with that chart is that is works only if the compliance number is calculated at 10hz. Most Japanese compliance numbers are calculated at 100hz, so the chart does not give you an accurate reading.
I found this link:
http://www.resfreq.com/resonancecalculator.html
For example, I'm looking at the Audio Technica ART9 cartridge. The weight of the cart is listed at 8.5 grams with a compliance number of 18 (100hz). So, adding the effective mass of my tonearm (12.5) to the 8.5 gram weight of the ART9 and factoring in another 1 gram (approximate) for mounting screws and nuts, I have a total mass (arm + cart + mount) of 22 grams. When I plug that number in plus the 18 compliance number, I get resonance of 7.998. Now, if I'm reading this right (am I'm not sure I am) then I take the product 7.998 and multiply that by 1.5 then the result, subtract 2. What I get is this: (7.998 x 1.5)-2 = 9.997. So, am I correct in surmising that if calculated at 10hz rather than 100hz, the resonance frequency would have come out at 9.997? If true, this would suggest the AT ART9 is a perfect match for a medium mass tonearm.
Can any smart math types/engineers confirm my thinking or point out where/how it is defective.
Thanks.
I'm trying to figure out the correct conversion. Some of the stuff I've seen from a google search seems to be all over the map.