Lots of different models. Some conventional(woofer and tweeter), some coaxial, some dual-concentric. If they are vintage Tannoys, they would be well worth looking into. Chances are you have something along the lines of a conventional driver setup, which is still good, although Tannoy does make a small bookshelf(standmount), mass-market dual-concentric line, using 6 and 8 in. poly drivers.