How can I find effective piston area?

mstar · 19th June 2006, 02:30 AM

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.

hitsware · 19th June 2006, 02:43 AM

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

kelticwizard · 19th June 2006, 03:03 AM

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.

kelticwizard · 19th June 2006, 03:11 AM

6" should be a bit below 21 sq in-like 18 sq in, or 112 sq cm .

mstar · 19th June 2006, 03:40 AM

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?

mstar · 19th June 2006, 03:40 AM

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

mstar · 19th June 2006, 03:40 AM

Thank you

Norcad · 19th June 2006, 10:48 PM

Hello
In Bassbox Pro 6, the Sd is calculated to 81.16 sq cm.

Norcad

hitsware · 19th June 2006, 11:31 PM

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

jamikl · 20th June 2006, 02:29 AM

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

19th June 2006, 02:30 AM	#1
mstar diyAudio Member Join Date: Jun 2006	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.

19th June 2006, 03:03 AM	#3
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	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. __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

19th June 2006, 03:11 AM	#4
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	6" should be a bit below 21 sq in-like 18 sq in, or 112 sq cm . __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

19th June 2006, 10:48 PM	#8
Norcad diyAudio Member Join Date: Jun 2006	Hello In Bassbox Pro 6, the Sd is calculated to 81.16 sq cm. Norcad __________________ Norcad

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

19th June 2006, 02:43 AM	#2
hitsware diyAudio Member Join Date: Mar 2002	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

19th June 2006, 03:40 AM	#5
mstar diyAudio Member Join Date: Jun 2006	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?

20th June 2006, 02:29 AM	#10
jamikl diyAudio Member Join Date: May 2005 Location: Melbourne	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

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Effective mass??	dario54	Analogue Source	6	6th August 2008 07:40 PM
effective mass	IZHAKKATZ	Analogue Source	6	6th August 2007 08:48 AM
What's the effective delay ?	Will	Multi-Way	8	26th March 2006 06:45 AM
Do You Have an old Blown Percision Power PPI 12 inch flat piston?	newtothis	Car Audio	0	2nd September 2005 12:30 PM
How is the effective piston area of a cone calculated?	454Casull	Multi-Way	2	21st June 2004 08:51 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read