"Full range single driver" (FRSD) is often an oxymoron. Because there is no crossover, the midrange and a few octaves on either side might be the best you ever heard, but they are lacking at the extremes, necessitating a subwoofer, supertweeter or both. Many times these are simply cobbled together and levels, timbre, phase, etc., are often mismatched. An exception would be German Physiks and a few others that do employ only one driver and achieve phenomenal extension. Most do not.
Wilson Benesch uses a 2.5 way design that direct-couples their midrange driver to the amp. This 7 inch driver’s frequency response is approximately <100Hz - >5KHz, which some might regard as full range or close to it, practically speaking. They then use acoustic or first order crossovers to mate this driver with their proprietary tweeter and woofers to yield 30Hz to 30KHz. While a subwoofer will be needed to get to 20Hz, the seamless integration of their "FRSD" with their impeccably designed, constructed and matched high and low ends yields what I think many are trying to achieve, which is a lucid midrange with transparent extension to the extremes.