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
Ported is typically a 3dB increase. Doubling cone area is typically a 3dB increase. So thus on paper one 12" sub ported = 2 12" subs sealed.
Generic Rule Of Thumb In Car Audio.
Look For The Subwoofers Specs. The T/S Specs, Find The Sd, That Is The Woofers Effective Cone Area, Radiating Sound.
Different Subs = Different Specs.
Look For The Subwoofers Specs. The T/S Specs, Find The Sd, That Is The Woofers Effective Cone Area, Radiating Sound.
Different Subs = Different Specs.
QUOTE (the727kid @ Jul 18 2008, 12:26 AM) 
Ported is typically a 3dB increase. Doubling cone area is typically a 3dB increase. So thus on paper one 12" sub ported = 2 12" subs sealed.
so 2 ported = 4 sealed so on and so forth?
QUOTE (Highridah @ Aug 9 2009, 02:38 PM)
so 2 ported = 4 sealed so on and so forth?
Same subs on the same power, ported would be just as loud if not louder
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