Matching 10" 3D to cartridge

Matching 10" 3D to cartridge

Postby Randy » Sun Feb 25, 2018 6:11 pm

Aloha,

I purchased the Prime Signature w/3D 10" arm and the Lyra Kleos (VPI recommended) but I see that the effective mass of the 10" 3D is "9" while the compliance of the Kleos is "12". Is this a good combination? Should I increase the EM of the tonearm? If so, how?

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Re: Matching 10" 3D to cartridge

Postby teenage diplomat » Mon Feb 26, 2018 8:03 pm

If you know the arm’s effective mass and the cartridge’s compliance, you can use the calculator at www.resfreq.com to determine the combination’s resonant frequency. Ideally, your number should be somewhere between 8-12 hz. Hope this helps.
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Re: Matching 10" 3D to cartridge

Postby steveo » Mon Mar 05, 2018 8:55 pm

Resonant frequency, R = 1000/(2*pi*sqrt((Tm+Cm)*C)), where Tm=tonearm mass, Cm=cartridge mass and C=cart. compliance. In the case of the 3d 10 inch arm and the Kleos, you get R = 1000/(2*pi*sqrt((9+8.8)*12)) is about 10.9, so on paper it looks good (c.f. Teenagediplomat's post). The formula above ignores any mass from the mounting screws, but that shouldn't change the result much.
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Re: Matching 10" 3D to cartridge

Postby BillK » Fri Jun 15, 2018 3:26 am

I've had first a Lyra Kleos and now a Lyra Atlas on my 10" 3D with spectacular results.
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Re: Matching 10" 3D to cartridge

Postby Peer Gynt » Fri Jun 15, 2018 11:55 pm

steveo wrote:Resonant frequency, R = 1000/(2*pi*sqrt((Tm+Cm)*C)), where Tm=tonearm mass, Cm=cartridge mass and C=cart. compliance. In the case of the 3d 10 inch arm and the Kleos, you get R = 1000/(2*pi*sqrt((9+8.8)*12)) is about 10.9, so on paper it looks good (c.f. Teenagediplomat's post). The formula above ignores any mass from the mounting screws, but that shouldn't change the result much.


FWIW, you can just add the hardware mass to the cartridge mass and use their combined mass in the formula. I mounted a 4.1 gram low compliance cartridge on an Ittok LVXX tonight, and I had to add mass (longer screws and extra nuts) to get it to balance and to move the 1st resonance into the desired range.
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