cone area

[fast85_gt]

1 inch was taken off for each driver do the math

 

[mrogowski 5,000+ posts]

Unfortunately, there is no standard for measuring cone area. Some use the cone plus the surround, others use just the cone. One company who shall remain nameless even states their products deliver the equivalent air of one size larger because of how their cone/surrounds are "designed".

The closest to a "standard" that was ever reached was made by DUMAX measurements. DUMAX measured the cone plus one third surround - a logical valuation.

If you were to use DUMAX as your reference, the best you could hope for is a rough set of numbers since all cone/surround dimensions are not made the same.

Best,

Mark

 

[roarzorz 10+ year member]

I think you copied that straight from a sticky on another website without any understanding of why it was ever posted/stickied. Since there isn't any standard way to determine cone area you have to generalize. Organizations such as MECA and Iasca use this "generalized" way to measure cone area. It's just a basic comparative for noobs.

 

[buggsson 10+ year member]

For surrounds, the most common method in my humble experience is thay many use 1/2 the surround.

Regardless of how they are measured, I just would like to point out that the published Sd of many subs with the "same" size, can have very varying cone areas. I have a small list of 12" subs, where the sub with the smallest Sd has only 399 cm^2, and the largest 511 cm^2. That makes the larger cone area approx 28% larger, quite a difference I would say. My guess is that you cannot only take diameter or radius into consideration, what about shape, flat vs. conical for example?

 

[Rashaddd 5,000+ posts]

ok so if im wrong then why do they post this on sundownz website compair this to my calcscone area: There are different methods for calculating cone area, depending on the shape of the subwoofer. For round subwoofers, the formula for calculating cone area is Radius squared times Pi (3.14). Example: Take a ten inch round subwoofer; the radius of all subwoofers is half the diameter, so the radius of a ten inch subwoofer would be 5 inches; the radius squared would be 5 times 5 which equals 25. 25 times Pi (3.14) equals 78.5. And there you have it; the total cone area of a ten inch subwoofer is 78.5 square inches

That is misleading...I'm not sure why jacob has that up there if that's on sundown's site, as I'm sure he knows the difference..

Yes, that is still wrong.

 

[roarzorz 10+ year member]

I don't think it's on the Sundown Audio website at all. It's on SMD.

 

[boomin spl 10+ year member]

i have heard 1/3 and 1/2 of the surround add to cone area. Regardless if the numbers are exact, it still gives the newer guys some rational as to how their speakers measure up. I have done 10" cones with 9.25" diameter, and also 7" diameter, there is no exact set 10"=XX.XX sq inches. if you really need to know how much cone area you have, measure it out, and do the math

 

[jusBloud 10+ year member]

what is the cone area of a square kicker 12?

 

[99grandprixGT 5,000+ posts]

LxW?

 

[jusBloud 10+ year member]

LxW?

they throw me a curve ball with the math every time so i just straight out ask.

 

[Kyle_Keating 10+ year member]

hope this helps How to calculate cone area

Cone area = pi x (r x r)

pi = 3.14 r = radius of sub

One 8" = 50.27

One 10" = 78.54

One 12" = 113.1

One 15" = 176.71

One 18" = 254.47

Two 8" = 100.53

Two 10" = 157.08

Two 12" = 226.19

Two 15" = 353.43

Two 18" = 508.94

Three 8" = 150.8

Three 10" = 235.62

Three 12" = 339.29

Three 15" = 530.14

Three 18" = 763.41

Four 8" = 201.06

Four 10" = 314.16

Four 12" = 452.39

Four 15" = 706.86

Four 18" = 1017.87

in general, each woofer is different, but even for average sizes those are not accurate. The woofer size is NOT the size of the cone. For example, most 18" woofers have 14"-15" cones - a whole lot less! You also don't include the surround much, rule of thumb is about 1/3 on each side contributes to displacement.

in square meters you can pretty much pin most stuff to these ranges:

8" 0.016 - 0.018

10" 0.03 - 0.035

12" 0.045 - 0.055

15" 0.075 - 0.085

18" 0.10 - 0.12

 

[smd4life 5,000+ posts]

also the subs displacement has an effect

 

[Anniku989 10+ year member]

Again, going with the theme of this thread (not specifics, but just to help those wondering if ... like five 8"s are more/less cone area then a 15")

http://www.caraudio.com/forum/showthread.php?t=351171