Is this a typo? (1 Viewer)

[Dustin B]

http://www.northcreekmusic.com/Drivers.html
Sd = 0.397 m^2
Xmax Linear P-P = 28.7mm
That would give a Vd of 11.4L
BP1803 is only 0.1217 m^2 which is over 3x as much surface area. How can the Sd of two 18" drivers differ by that much?

 

[Dan Hine]

I'm not sure if it's a typo or not. But for $849 instead of just rumbling my house it had better get up and smack me in the head too!
Dan Hine

 

[Greg Monfort]

Since 0.397m^2 correlates to a 27.99" dia., it's got to be a typo. 0.1397m^2, or 16.6" dia., puts it in the ballpark.

GM