Dynamic vs. Static compliance

Irakli · 14th October 2006, 06:00 AM

Hi All

I was looking at Audio Technica OC9MLII specs at

http://www.lpgear.com/Merchant2/merc...gory_Code=XMAS

I found two compliances listed: dynamic and static.
Never seen such a distinction before.
Could anybody recommend which one should I use for tonearm/cartridge resonant frequency calculation?

Regards, Irakli

Panicos K · 15th October 2006, 08:57 PM

Irakli?The Greek?Use the dynamic compliance for your calculations.

Irakli · 15th October 2006, 09:47 PM

Not Greek, Georgian. Thanks for advice.
I want to use AT OC9MLII with Thorens TP-11MKIII tonearm with effective mass7.5 g.
If I use 35x10-6 dyn/cm compliance, the resonant frequency comes to 8Hz. Perfect!

Thanks

Werner · 16th October 2006, 06:37 AM

You need the Dynamic Compliance as measured at 10 Hz, since with most arms you'll end up with a resonance f in this neighbourhood.

Sadly, most manufacturers specify it at 100Hz, including AT. This is a useless spec.

The compliance at 10Hz will be somewhere between the static one and the dynamic one at 100Hz. For the AT it lies probably around 18 cu.

14th October 2006, 06:00 AM	#1
Irakli diyAudio Member Join Date: Aug 2004 Location: washington, DC Blog Entries: 1	Dynamic vs. Static compliance Hi All I was looking at Audio Technica OC9MLII specs at http://www.lpgear.com/Merchant2/merc...gory_Code=XMAS I found two compliances listed: dynamic and static. Never seen such a distinction before. Could anybody recommend which one should I use for tonearm/cartridge resonant frequency calculation? Regards, Irakli

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15th October 2006, 08:57 PM	#2
Panicos K diyAudio Member Join Date: Oct 2006	Irakli?The Greek?Use the dynamic compliance for your calculations.

15th October 2006, 09:47 PM	#3
Irakli diyAudio Member Join Date: Aug 2004 Location: washington, DC Blog Entries: 1	Not Greek, Georgian. Thanks for advice. I want to use AT OC9MLII with Thorens TP-11MKIII tonearm with effective mass7.5 g. If I use 35x10-6 dyn/cm compliance, the resonant frequency comes to 8Hz. Perfect! Thanks

16th October 2006, 06:37 AM	#4
Werner diyAudio Member Join Date: Jan 2002 Location: Belgium	You need the Dynamic Compliance as measured at 10 Hz, since with most arms you'll end up with a resonance f in this neighbourhood. Sadly, most manufacturers specify it at 100Hz, including AT. This is a useless spec. The compliance at 10Hz will be somewhere between the static one and the dynamic one at 100Hz. For the AT it lies probably around 18 cu.