Yes this is the model number for the scan speak driver it is18w/8545k a 7 inch carbon fiber/paper woofer. The usher is
8945a also a carbon fiber/paper woofer. The price diffrence is
$ 38.85. Is it really a diffrence in sound and extra bells and things
like for the scan speak sd-1 r3,kapton former a grasshopper castframe
does this really make a diffrence or is it just adding to the driver
to make it look like your getting more? The usher not to much going
on over there. A lot of people think it is a newer design of the same
driver. I am goin to use them in a ported box a 2 way. All for music
only. I have a hometheater set up so it will not be used for that.
I am looking at getting the woofer testerr 2 from parts express.
It seems to work really well and this is my 3rd speaker I am building
and want to get it right. Well if you want to know more just e-mail
me and I will try to get you the best answer I can. Thanks jm