Ah, the mighty Bozaks! One of my all-time favorite speakers that I've owned were the Bozak B501 Concerto VII's....very smooth with a fabulous midrange. Wish I still had them. They were great for all types of music, but were especially good with large orchestral types. Actually, in their heyday, many orchestras used Bozaks to augment their sound. I remember back in the 70's being at a concert at the Hollywood Bowl where oodles of Bozaks were lined up above the sound stage.
If you want to try to replace your midrange, it's a model B209 8 ohm. They can be found occasionally on eBay,