Resonance Frequency

DR ANALOGUE · 10th January 2006, 02:34 PM

Dear Experts,

I am measuring a Scan Speak mid woofer (8530K00) and do not reach the Fs indicated by the manufacturer.

30Hz are the indicated by scan speak.
my measurement results around 34hz.

speakers are burnt in several days, measuring stripes are very short etc.

is more than 10% deviation normal?
how do you think about using modified parameters?

thanks for any answers!

Michael

kelticwizard · 10th January 2006, 02:42 PM

I think that's pretty good.

34 Hz is only 0.18 octave higher than the rated spec of 30 Hz-pretty close.

Ron E · 10th January 2006, 02:53 PM

Gruss Gott

It is within the realm of manufacturing tolerances. Assuming Vas is a bit smaller than spec you will have no problems at all even if you use factory parameters. Best is to use the parameters you measure, however.

gcm908 · 10th January 2006, 06:06 PM

Hello...

I am very intrested in this driver 8530K00.

If you don'tmind, what are you using it for?

Thanks,gcm908

DR ANALOGUE · 10th January 2006, 08:30 PM

Wow !!!

I am more than satisfied - This forum is really great !!!
Thanks a lot for your immediate replies!
(And thanks for the "gruess gott" :-)

Using the Scan Speak 8530K00 in my application is a bit curious, but with pleasure I answer your question:
Maybe you would expect that I use this excellent driver in combination with a ribbon or electrostatic tweeter, aren't you? :-)
The opposite is the case: The Scan Speak provides the low end of a full range Jordan JX53. Cross-over will be at 200-400 according to listening tests, membrane movement and impedance compensation.
The reason for this is an existing full wood box and a lower quality woofer to be replaced.
However, the full range is rather "quick" and so the Scan Speak might "fit" better to the full range Jordan especially with a flat 6dB cross-over.
By the way, I will also replace the Jordan with the new Jordan JXr6 HD.
The Scan Speak leaves optically an extraordinary high quality impression. Acoustically I can't say anything yet.

With audiophile wishes
Michael

Scottmoose · 11th January 2006, 07:49 AM

If you're within 4Hz, I'm impressed. I love the Vifa P13W. However... Vifa state it has an Fs of 60Hz. Average reality: 75Hz.

10th January 2006, 02:34 PM	#1
DR ANALOGUE diyAudio Member Join Date: Jan 2006 Location: Austria	Resonance Frequency Dear Experts, I am measuring a Scan Speak mid woofer (8530K00) and do not reach the Fs indicated by the manufacturer. 30Hz are the indicated by scan speak. my measurement results around 34hz. speakers are burnt in several days, measuring stripes are very short etc. is more than 10% deviation normal? how do you think about using modified parameters? thanks for any answers! Michael

10th January 2006, 02:42 PM	#2
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	I think that's pretty good. 34 Hz is only 0.18 octave higher than the rated spec of 30 Hz-pretty close. __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

10th January 2006, 02:53 PM	#3
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	Gruss Gott It is within the realm of manufacturing tolerances. Assuming Vas is a bit smaller than spec you will have no problems at all even if you use factory parameters. Best is to use the parameters you measure, however. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley

10th January 2006, 08:30 PM	#5
DR ANALOGUE diyAudio Member Join Date: Jan 2006 Location: Austria	8530K00 Wow !!! I am more than satisfied - This forum is really great !!! Thanks a lot for your immediate replies! (And thanks for the "gruess gott" :-) Using the Scan Speak 8530K00 in my application is a bit curious, but with pleasure I answer your question: Maybe you would expect that I use this excellent driver in combination with a ribbon or electrostatic tweeter, aren't you? :-) The opposite is the case: The Scan Speak provides the low end of a full range Jordan JX53. Cross-over will be at 200-400 according to listening tests, membrane movement and impedance compensation. The reason for this is an existing full wood box and a lower quality woofer to be replaced. However, the full range is rather "quick" and so the Scan Speak might "fit" better to the full range Jordan especially with a flat 6dB cross-over. By the way, I will also replace the Jordan with the new Jordan JXr6 HD. The Scan Speak leaves optically an extraordinary high quality impression. Acoustically I can't say anything yet. With audiophile wishes Michael

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10th January 2006, 06:06 PM	#4
gcm908 diyAudio Member Join Date: Nov 2004 Location: Northeast USA	Hello... I am very intrested in this driver 8530K00. If you don'tmind, what are you using it for? Thanks,gcm908

11th January 2006, 07:49 AM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	If you're within 4Hz, I'm impressed. I love the Vifa P13W. However... Vifa state it has an Fs of 60Hz. Average reality: 75Hz.

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