Aerial 9B's for sale?


Does anyone know what an Aerial 9B is? I have never heard of the "B" designation applied to the Model 9, and I cannot find it on their website. However, two pair of them just came up for sale by two different sellers. Was there a modification made to the Model 9?
mitch2
I would be very interested in a review with some comparisons to other Aerials and other speakers generally.

Thanks!
SO I GUESS THE MODEL 8B'S ARE JUST AN 8 ONLY B STOCK AS WELL. THE SALESMAN TOLD ME THEY ARE 3 YRS OLD AND HE WILL LET THEM GO FOR COST ($3500.00 PR). I TOLD HIM IF THEY WERE DEMO'S THAT WERE 3 YRS OLD AND STILL THERE THEY SHOULD BE CONSIDERED USED.
The Model 8b was a revised version of the Model 8 that included changes to the crossover and internal damping.