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Old 7th March 2004, 07:33 AM   #1
frugal-phile(tm)
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Default Sanity check

The ApexJr Super 8 has BL measured as 2.287 lb/A.

Click the image to open in full size.

To use Martin's model i need BL in N/A

with 1 lb-ft = 1.356 Nm and 1m = 3.281 ft i'm figuring

1 ft/A = 4.45 N/A

ie this driver has a BL of 10.175 N/A ??

dave
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Old 7th March 2004, 07:41 AM   #2
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Got a link so I can look up the Thiele-Small parameters on that?

BoxModel will straighten this out.
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Old 7th March 2004, 07:59 AM   #3
Wizard of Kelts
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Here are your Thiele-Small parameters via BoxModel.

Bl is 9.18 Tm which I believe is the same as NA.

The numbers in the dark blue I wrote in, (I estimated 200 sq cm for the Sd), and the numbers in the light green underneath BoxModel calculates.

Neat, huh?
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Old 7th March 2004, 09:03 AM   #4
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Here are the measured parameters picked out of the pdf at ApexJr

dave
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Old 7th March 2004, 11:31 AM   #5
sreten is offline sreten  United Kingdom
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Default Re: Sanity check

Quote:
Originally posted by planet10
The ApexJr Super 8 has BL measured as 2.287 lb/A.

To use Martin's model i need BL in N/A

with 1 lb-ft = 1.356 Nm and 1m = 3.281 ft i'm figuring

1 ft/A = 4.45 N/A

ie this driver has a BL of 10.175 N/A ??

dave
Should be just a case of converting pounds to newtons,

(1kg = 2.2 lbs = 9.8 newtons)

2.287 lb/A = 1.04 kg/A = 10.2 N/A.

sreten.
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Old 7th March 2004, 07:04 PM   #6
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Thanx Sreten... i've long lost handy access to all those convrsions in my head, and the others were the only quick factors i can find... now that i see 1 kg=9.8 N it all comes back... thanx for the forhead slapping moment

dave
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Old 7th March 2004, 07:59 PM   #7
sreten is offline sreten  United Kingdom
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You still got the right answer, near enough, sreten.
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Old 7th March 2004, 08:32 PM   #8
joensd is offline joensd  Germany
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Here´s a handy tool for converting quite a few units which I recently found on the net :
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Old 7th March 2004, 09:08 PM   #9
fireman is offline fireman  Canada
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Hey Dave, what are you up to with this woofer ?

I meant to build something with this baby a few months ago. Time and money had me put the project to rest for a while. If I get the promotion I applied for, I guess it'll will have to wait 'til I move to my new workplace. Hopefully, I'll then have a real workshop where I can work on my speaker projects.
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Old 7th March 2004, 09:13 PM   #10
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Quote:
Originally posted by joensd
Here´s a handy tool for converting quite a few units which I recently found on the net :
Useful if you are running Windows....

I downloaded an OS X ap called Balance Pro... but didn't find the lbs > Netwtons conversion till just looking now.

http://www.MacDev.ca/

dave
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