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How many 6.5in driver equals one 8in driver

If I am doing a simple math equation of a surface of a circle, pi * r^2, then:

8in. :  3.14 * 4 ^2 = 50.24 in^2

6.5in:  3.14 * 3.25^2 = 33.16 ^2

 

So it seems like it will take 2 6.5in drivers to equal an 8 in. driver.

andy2
andy2 OP
1,619 posts
 

Here is the impedance plot of SB Satori Textreme 5in. woofer.  It stays pretty flat.

westcoastaudiophile
819 posts
 

one driver plot, probably the best selected one, out many manufactured!

SPL (f) plot will be messy for many drivers in series..

btw., pl. try to measure 10x of those and compare.. that’s what I did many years ago..

jafant's avatar
jafant
21,599 posts
 

andy2

The Math tells us 2.5 is the answer. I would up the ante to (4) 6.5 inch drivers equaling a single 8" driver. When designed and properly enclosed, an 8 inch driver/woofer can sound outstanding!  Same goes for running (2) 8-inch driver/woofers in series.

 

Happy Listening!

elliottbnewcombjr
7,725 posts
 

@jonwolfpell 

"The smaller driver has to move faster & further than the big driver to produce low notes at higher volumes"

please clarify, I get 'long throw' to move more air, or move it more forcefully, but wouldn't faster be higher frequencies?

andy2 OP
1,619 posts
 

The Math tells us 2.5 is the answer. I would up the ante to (4) 6.5 inch drivers equaling a single 8" driver. When designed and properly enclosed, an 8 inch driver/woofer can sound outstanding!  Same goes for running (2) 8-inch driver/woofers in series.

How did you come up with (4) 6.5in. drivers equal an 8in. driver?  On what basis?

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