Welcome!
Have been a single driver fan for 20 years. Commissioned Bob Brines (now retired) to design/build a pair of floor standing transmission lines (from Martin King's MathCad application) in 2004 using Fostex F200a drivers (rated 30-20,000 Hz, 90 dB/w/m, 8 ohms, AnNiCo magnet, no whizzer) that I later had EnABL'd by Bud Purvine (who invented the treatment process). Now thanks to Duke LeJeune run them in parallel with "Late Ceiling Splash" ambience tweeters to enhance high frequency response/expand soundstage and thanks to Floyd Toole have added 3 subwoofers to fill in the bass and deal with inherent in-room bass peaks/dips. Suggest reading his "Sound Reproduction" 3rd edition to learn how speakers behave in-room.
Don't believe in whizzer cones, see them as mechanical crossovers that interfere with the wave form coming off the main cone and suffer from phase mistakes of the whizzer cone "tweeter" riding on the main cone wave forms. In that case would rather go with active coincidental monitors.
A surprising mix: GR Research and Cube Audio.