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Benz Lp-s Frequency Resonance Problems

Hi to all,

As i mentioned on another thread, i have some problems with my Lp-s on my Graham Phantom arm, i have problems with little warps. I have measssured with the Hifi News Lp and lateral i have between 8hz-5hz and vertical i don't know well as i can't see cartridge wobble or hear any distortion. But for my problem the important is the lateral test.
Benz recommends medium to high mass arms but that's impossible!
To get 10hz frequency resonance you need a 0 gram mass arm!

I don't know if to try a Reed arm, the lightest one is 10gr effective mass and i should have 8hz Resonance frequency.

Any idea?

Many thanks
agucela
stringreen's avatar
stringreen
5,112 posts
 
My LPS is tracking flawlessly in my VPI. I had to get a weight to properly balance it, however, it is beautiful now. I would call Graham and ask them
agucela OP
17 posts
 
I spoke with both,

Graham says that the arm is able to balance it out, and the arm does, but this is not the problem. The problem are the warps because of the effective mass. It is too much mass for this compilance.

And Benz says that i have to try and when it don't work with a arm, then try with another arm. They say that for example, they tried with SME IV and V and measured with the HN Lp lateral frequency resonance was between 9hz-9,5hz.

Mine is at 6,5-7hz, that is too low and i hear it with little warps.
agucela OP
17 posts
 
Stringreen,

Did you measured with the HN Lp ?
What is the effective mass of your arm?
kmccarty's avatar
kmccarty
99 posts
 
Hmmm...I'm using the Benz LPS with a Graham Phantom Supreme (10" arm) with no issues at all. I use a Benz LP (not -S, but with micro ridge stylus) on another turntable with a Graham Phantom Supreme (9" arm) also with no problems. Both track warps flawlessly without causing resonance problems.
dougdeacon
3,338 posts
 
From the facts presented it seems probable that this particular LP-S got out of the factory with an out-of-spec suspension (or it's old and worn out). It's behaving like a cartridge with a more compliant suspension than a typical LP-S.

Suggestion: try it on a different tonearm and see if it exhibits unusually low resonance frequencies there too. If so, the cartridge suspension is suspect.

P. S. Also, try reducing VTF. Excessive VTF could contribute to such behavior. And don't quote me what your scale or the manufacturer's guidelines say, just try it. :)
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