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Old 19th June 2006, 02:30 AM   #1
mstar is offline mstar  United States
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Default How can I find effective piston area?

Hi,
I was trying to plug in some numbers in a computer program for box volume and can not find a listing for the Sd (effective piston area) for the Dayton RS150-4 (file 295-372z)
I am new to this so please bear with me. Is it listed in any of these numbers?
D: 102.00
MmS: 6.53 G
Cms 1.13 (mm/N
Bl: 3.79
L1K: .38 (mh
L10K .14
All the other numbers seemed to have a spot to enter into the program

Dimentions A: 5-5/16" B: 4-13/16" C" 2 3/4"

Is there a way to get the Sd?

Thanks for a prompt response.
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Old 19th June 2006, 02:43 AM   #2
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measure accross the driver from the center of the surround on one side to the center of the surround on the other side (at the widest part) then Sd ~ pi * (measurement/2)^2
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Old 19th June 2006, 03:03 AM   #3
Wizard of Kelts
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The Sd< 9diaphrgm area), does not have to be exact. A ballpark figure will do nicely, and not change the frequency response .

Here is a list of Sd's for various size drivers.

15": 132 sq inch, 825 sq cm

12": 84 sq inch, 525 sq cm

10: 55 sq inch, 344 sq cm

8": 32 sq inch, 200 sq cm

6.5": 21 sq in, 131 sq cm

5.25: 12.5 sq in, 78 sq cm

Your speaker is a 6". not 6.5 in, so it would be safe to assume an Sd slightly below 21 sq in-like 18 sq in, or 112 sq cm.
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Old 19th June 2006, 03:11 AM   #4
Wizard of Kelts
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6" should be a bit below 21 sq in-like 18 sq in, or 112 sq cm .
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Old 19th June 2006, 03:40 AM   #5
mstar is offline mstar  United States
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Hi,
I do not know this math.
I do not have the driver yet. I was trying to figure out if the driver willwork in my volume and needed the Sd for the computer formlas to work.
All I know is that it is 5 15/16" in diameter end to end.
Is this enough info?
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Old 19th June 2006, 03:40 AM   #6
mstar is offline mstar  United States
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Thanks. What about a 6"?

Quote:
Originally posted by kelticwizard
The Sd< 9diaphrgm area), does not have to be exact. A ballpark figure will do nicely, and not change the frequency response .

Here is a list of Sd's for various size drivers.

15": 132 sq inch, 825 sq cm

12": 84 sq inch, 525 sq cm

10: 55 sq inch, 344 sq cm

8": 32 sq inch, 200 sq cm

6.5": 21 sq in, 131sq cm
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Old 19th June 2006, 03:40 AM   #7
mstar is offline mstar  United States
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Thank you
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Old 19th June 2006, 10:48 PM   #8
Norcad is offline Norcad  Norway
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Hello
In Bassbox Pro 6, the Sd is calculated to 81.16 sq cm.

Norcad
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Old 19th June 2006, 11:31 PM   #9
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Quote:
Originally posted by Norcad
Hello
In Bassbox Pro 6, the Sd is calculated to 81.16 sq cm.

Norcad
Then the 'D' given must be effective diameter.
So the radius = D/2 = 51 (mm)
area = pi * r^2
Sd = area = 3.14*51^2 = 3.14*2601 = 8167sq.mm = 81.67sq.cm
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Old 20th June 2006, 02:29 AM   #10
jamikl is offline jamikl  Australia
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A formula we always used in the motor trade for area of circle which means not having to use the radius, as the dia. is nearly always given is 11/14*D^2
jamikl
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