sa 8 gettin low?

[1rockford1 5,000+ posts]

lol

 

[09civic 5,000+ posts]

when i was typing it sicaudio didnt post it yet but when i posted it he had already posted:fyi:

 

[SicAudio 5,000+ posts]

lol did i sound serious?

yeah you did....

 

[09civic 5,000+ posts]

lol you know what **** you guys im only 16 and i knew what that meant but my ******* friend who has a system thought i was talking spanish to him lol

 

[Kyle_Keating 10+ year member]

12" drivers don't have 12" cones, they are close to 9 3/4" Its called "sd" and its a part of the more complete sensitivity specification or sometimes called "spl" or splsens.

You need to look at the mfr spec, but 8's have about 26 square inches, so four of them would have about 100 square inches so you're off by a factor of twice the surface area or about 6dB... huge error!

12's about 75 square inches of area or 150 for a pair or about 50% more than four 8's.

If xmax is equal, then the 12's also have the displacement advantage down low. If the BL is equal then the 8's have a lower Q and can operate in a smaller box and have the power handling advantage.

If you have the space, then two 12's have higher value. 8's are really not an optimal size for subwoofers so they tend to be nitch and nostalgic, but sometimes irresistible!

 

[roarzorz 10+ year member]

:facepalm:

 

[SicAudio 5,000+ posts]

4x 8's == 200 sq inches2x 12's = 226 sq inches //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif....

now both of those are accounting for literal dimensions which neither 1 is...but regardless the 12's have more cone area period...

12" drivers don't have 12" cones, they are close to 9 3/4" Its called "sd" and its a part of the more complete sensitivity specification or sometimes called "spl" or splsens.
You need to look at the mfr spec, but 8's have about 26 square inches, so four of them would have about 100 square inches so you're off by a factor of twice the surface area or about 6dB... huge error!

12's about 75 square inches of area or 150 for a pair or about 50% more than four 8's.

If xmax is equal, then the 12's also have the displacement advantage down low. If the BL is equal then the 8's have a lower Q and can operate in a smaller box and have the power handling advantage.

If you have the space, then two 12's have higher value. 8's are really not an optical size for subwoofers so they tend to be nitch and nostalgic.

but you are dead on either way //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

I figured if he didn't know how to do the basic math the rest would all be greek to him lol

you explanation however is very easy to make sense of even for someone that has no clue //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif kudos dude.

 

[RAM_Designs 5,000+ posts]

Yeah, gotta use sd values. Something that I found to be more accurate, yet still easy to do is just take the listed size of a woofer, say 12", and take off 2" when finding cone area. It's not exact, but good enough in most cases.

(4)8" woofers = 3^2(pi)(4) = 113in^2

(2)12" woofers = 5^2(pi)(2) = 157in^2