Kleos Sibilance

When I purchased a new cart for my Signature arm, I used the following to determine if the cart could be compatable. I purchased the mentioned cart.

ZYX Fuji R100 X(H)-SB
- Cart weight 9 (5 cart, 4 SB)
- Compliance 15 horizontal, 12 vertical

JMW-9 Tonearm
- Effective mass 7.7

JMW-9 Signature Tonearm
- Effective mass 9.5

RESONATE FREQUENCY EQUATION

rf = 159 / sqrt ((eff. mass + cart weight + fastener weight) * (compliance))

CALCULATIONS

JMW-9 Tonearm
- Resonant freq 9.9 horizontal, 11.1 vertical

JMW-9 Signature Tonearm
- Resonant freq 9.4 horizontal, 10.5 vertical

I would also check your spindle to pivot distance to ensure it is 223mm. With the VPI plinth, I can almost make this distance (just over 222mm). I also use the Mint LP Protractor as I find this more accurate than the supplied protractor.

I am not sure why any of this is not clearly documented, but having this has helped my situation. Maybe HW can comment on the above specification.

So, Maczurak, tell us how the resonant frequency relates to tracking sibilance. I'm rusty on the specifics.

Thanks,
Robert

This was a post more in response to text from 01-11-11: Robob. I also checked the Kleos as this is what I was planning on trying once I completed my project to replace my Scout plinth. I wouldn't buy any cartridge without first checking this calculation.

"Isn’t easier to send us an e-mail and ask us what works perfectly in the arm we make!!!!!"

That is one way to do it. The other is to buy the cartridge you want and if it does not work ask for help. If it cannot be made to work then one must go back to the previous cart, buy something else, or replace the arm. In this case I really wanted a Delos or a Kleos.

So the pivot to spindle distance for the JMW 9 is 223mm?

I will check this

"This was a post more in response to text from 01-11-11"

Which doesn't answer the question of how resonant frequency relates to sibilance.

It also does not refute the idea of buying the cart one wants and seeing if one can make it work.

And you failed to put quotes around my remark:

"That is one way to do it. The other is to buy the cartridge you want and if it does not work ask for help. If it cannot be made to work then one must go back to the previous cart, buy something else, or replace the arm. In this case I really wanted a Delos or a Kleos. "

Robert