Hey.....I know it's been awhile, LOL!
I have these same ones only the tweeter control is available on mine.....only difference I see from your pics! These, when placed well are really nice for Listening to what I listen to........which is Blues mainly and they shine with a good EQ because of my room dimensions aren't ideal.
If you still have these I would like to know what you think of them if you have done anything such as placements or ? I have mine, currently, connected to a Denon PMA-550 and they have excellent Bass, mids and highs for my tastes. Better than my old BA T-960's.
BTW: I run my amp with NO Tone controls (tone defeat) and my EQ at just barely above the "0" (midway) points and get the best out of these. I have heard the older "B series" but never owned any so I have no idea what to compare these to when it comes to Bozak history. I'm happy with these and because I'm not into anything more than 4 speaker amps......these and my BA's are mostly all I need for music.
Let me know if I can answer any specific questions.