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Kleos Sibilance

Hello Folks,

I posted this in a Delos thread but I thought I'd better start it's own thread.

I have a new Kleos in a JMW 9 Signature on a Scoutmaster. I am getting sibilance on vocals beyond what I have heard with either a Shelter 501 II or a VPI Ortofon on the same table. My dealer put the Kleos on the wand I had the VPI cart on. I have gone to 1.8g and did not solve it and I have checked the alignment. I brought the rear of the arm down as well. It may be less pronounced but it is still there. Otherwise the Kleos is quite nice. It has 3 or 4 hours on it now. I do not hear misstracking on high level passages, just sibilance and sometimes some grunge on male vocals. It is not on all vocals but it is fairly common.
robob

Showing 3 responses by maczurak

maczurak
28 posts
 
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.
maczurak
28 posts
 
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.
maczurak
28 posts
 
Debugging TT configurations remotely is difficult at best. As mentioned, the post was a response to your “unquoted” statement in the post’s body, nothing more.

As for the sibilance issue, if you still have the VPI and decide to have another go at it, I would ensure the tonearm base is securely fastened to the plinth. I would also try removing the junction box platform and securing the junction box directly to the plinth. I would also check the pivot point the tonearm balances on to ensure it’s not bent from tonearm wand removal or cart adjustments. Is your plinth firmly resting on all four feet without a slight wobble?

These are some areas I thought of while composing this post that I would look at in addition to just focusing on the cartridge.

Hope the new TT is what you are looking for.
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