I have a smaller pair of the SB series, the SB-4500A, and they're very decent 2-ways.
I believe the SB-series was a TOTL series, Technics best efforts at nabbing some speaker share back when.
I remember them in the late 70's at the local audio store, but in the SB line they never carried the ones with the horn mid/hi. I thought at the time that the SB's were a bit weird, came off as kinda goofy/cheesy, and pricey to boot. I probably misjudged them. They were trying to make a big deal about the time alignment of the drivers.
One of AK's members has a set of those. He didn't have them hooked up when I stopped by but when he does I will post my thoughts on em. Pictures do no justice to em.
Don't know about exclusive but Mburnstein ( The owner of those Technics speakers ) has the most amazing collection of new and old I have ever laid eyes on.
YIIIIKKKEESS; I just found a shot of the SB 9500 with the grill off. Now I think I want them, too!!! What size woofers do you guys think we're seeing here??