calculating cone area

[IgnoreMe 5,000+ posts]

sd = cone area

it stands for surface displacement (ok ok thats just a guess lol)

 

[Naledge503 10+ year member]

Sd- Effective piston radiating area of a subwoofer driver in square meters.

 

[DejaWiz 5,000+ posts]

Yes, the formula is A = Pi * r * r

The obvious: It's the cone diameter (not the subwoofer diameter) that is used.

Example: Polk 8" MM2048

Mount Diameter: 7.0625in

Diameter of cone: 6.65in (radius = 3.325in)

3.14 * 3.325 * 3.325 = 34.71 sq-in

(specs: http://www.polkaudio.com/caraudio/specs/mm2084/ )

For the example above, I simply took the Sd and worked the formula backwards.

 

[Immacomputer 10+ year member]

Only part of the surround is allowed to be used in calculating Sd. Even the part that gets used actually is a function of the movement of the cone and decreases as the cone moves further in and out.

Most respectable sub companies will list Sd. I don't know any companies that I would buy from that don't.

 

[DejaWiz 5,000+ posts]

Most respectable sub companies will list Sd. I don't know any companies that I would buy from that don't.

Agreed.

 

[Naledge503 10+ year member]

Yes, the formula is A = Pi * r * r
The obvious: It's the cone diameter (not the subwoofer diameter) that is used.

Example: Polk 8" MM2048

Mount Diameter: 7.0625in

Diameter of cone: 6.65in (radius = 3.325in)

3.14 * 3.325 * 3.325 = 34.71 sq-in

(specs: http://www.polkaudio.com/caraudio/specs/mm2084/ )

For the example above, I simply took the Sd and worked the formula backwards.

Got it now. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[ShakesAllDay 10+ year member]

http://www.the12volt.com/caraudio/thiele.asp

"Effective piston radiating area of driver, in square centimeters. "This is the actual surface area of the cone, normally given in square cm.""

edit: durrr welcome to 2 hours ago.

 

[jeremiah 10+ year member]

Yes, the formula is A = Pi * r * r
The obvious: It's the cone diameter (not the subwoofer diameter) that is used.

Example: Polk 8" MM2048

Mount Diameter: 7.0625in

Diameter of cone: 6.65in (radius = 3.325in)

3.14 * 3.325 * 3.325 = 34.71 sq-in

(specs: http://www.polkaudio.com/caraudio/specs/mm2084/ )

For the example above, I simply took the Sd and worked the formula backwards.

????help? my sub is 1029.2 cm2 how much sq-in is that?

 

[DejaWiz 5,000+ posts]

????help? my sub is 1029.2 cm2 how much sq-in is that?

divide by 2.54 twice since is square-cm.

1029.2 / 2.54 / 2.54 = 159.53 sq-in

 

[fwb_1234 10+ year member]

DD is too cool to give t/s parameters.....

 

[Immacomputer 10+ year member]

????help? my sub is 1029.2 cm2 how much sq-in is that?

Google that shit all day. Google's calculator converts all sorts of shit.

http://www.google.com/search?source=ig&hl=en&q=1cm%5E2+to+inches%5E2&btnG=Google+Search

 

[DejaWiz 5,000+ posts]

Google that shit all day. Google's calculator converts all sorts of shit.
http://www.google.com/search?source=ig&hl=en&q=1cm%5E2+to+inches%5E2&btnG=Google+Search

Werd. I hit that up at least half a dozen times a week.

 

[jeremiah 10+ year member]

O ok I gat it 159.5263191

 

[dragnix 5,000+ posts]

Only part of the surround is allowed to be used in calculating Sd. Even the part that gets used actually is a function of the movement of the cone and decreases as the cone moves further in and out.
Most respectable sub companies will list Sd. I don't know any companies that I would buy from that don't.

damn tc, damn audiopulse

 

[jeremiah 10+ year member]

^^?but TC is audiopulse?