My Dad had B-305 half a Concert Grand... not much treble extension but as others have said great midrange and floaty bloaty bass. I still have the Mac gear that ran em....
Bozak 312s from 1968
My first hi-fi speakers were a pair of Bozak 312s purchased in 1968 (from Lee Kramer of High Fidelity SSS in Atlanta for a whopping $310). About 3 years later I upgraded to the B-4000 Symphony and packed up the 312s in their original boxes. There they've stayed all these years until this August (2020). Amazingly, they still work! And sound fine. I'm surprised at how much bass those 12" woofers put out. I'll likely put them up for sale soon here in the greater Knoxville, TN area.