Are you referring to the 4x12 Bassman135 cab that housed the 12s angled inward from all 4 sides?
If so, I used to own the cabinet. Since it was a 4 ohm cab, I'm thinking the 12s were 4 ohm drivers. I don't have any more info on the speakers, except that I do remember them having small motors on them.
My opinion: It was not a good design, and I never liked it. It didn't have any punch, and highs were all but non-existent. 12s should have sounded better than that, even back in the day.
I tried various amps along with the Bassman135 head that came with it. I eventually tore out the 12s and the angled enclosure baffle, and rebuilt it as a 2x15 cabinet. The cab was not very well built. The angled baffles were particle board, glued and "stapled" together. The back of the cab was also particle board, with ply top, sides, and bottom. It had removeable casters, and the housings were mounted into particle board pieces at the bottom of the cab, which weren't strong.
I recently rebuilt the thing again after about 20 years sitting in my closet, and refitted it was 2x15s (eminence kappa pro LF-2s).. I'm gigging with it now.
I don't think that cabinet was one of Fender's better designs.
For what it's worth..
Mag...