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In Reply to: RE: Hagerman Piccolo Zero Headamp posted by tketcham on January 30, 2024 at 09:50:43
you will be able to measure the tonearm/cartridge resonant frequency loading your cartridge in a conventional way vs. this low impedance way and report your findings.I see your cartridge is 18x10-6 cm/dyn compliance (100Hz). Do you know, or have you measured, what it is a 10Hz?
18 times 1.7 is 30.6. At 9.5 grams your tonearm is heavy for your cartridge so less compliance might be a good thing in your case as long as it's not too much less.
According to the chart on the Vinyl Engine you would be better off with half the compliance giving you a resonance of 10Hz vs. 7Hz.
Thanks
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 01/30/24Follow Ups:
When I purchased the ART9 to use with the SME 309, the resonance calculations didn't look ideal. But after nearly 800 hours of play I never noticed any problems with distortion or rumble. I think the higher compliance actually works in my favor, despite what the chart says. I ran a Dynavector Karat 17D3 which has that short (1.7mm), lower compliance cantilever and had some problems with that cartridge getting thrown around with high energy passages or deep bass. There were times it would overemphasize vocal sibilance and sound harsh. I ended up using some heavier stainless steel cartridge mounting screws to dampen the resonances. Seems to have worked because I ran that cartridge up to 800 plus hours before I switched to the ART9.I'll have to re-read about testing/measuring resonance frequencies. It's not something I've ever done.
Edits: 02/01/24
Interesting musings, and experimentation here (part 1 or 4):
I've read some of his posts and he often has an interesting take on things. I'll give these a read, thanks.
The Hi-Fi News and Record Review test record HFN 001 has tones on it. When you hit the frequency that matches your resonance frequency you can see the tonearm shake.
10Hz is one octave above from the warp tones and one octave down from 20Hz, which should be the lowest tone cut in the groove. So that is why 10Hz is the target frequency. It all about placing the resonance where it will be the lease apt to be excited.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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