The Dayton DA115 and DA135 both sound nice and could be used as full range drivers. I have used a DA115 it as a midrange with no low pass filter with good success. Efficiency is low, however, it is a tradeoff of low Fs and small cone. These days, I prefer more efficiency and a somewhat higher Fs.
Nominal 5” driver. Decended from the Alpair 10.3. A very good driver. Also available in paper cone.
dave