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It takes a very special speaker to reproduce the entire audio spectrum without the aid of a crossover. Most well-regarded full range speakers cover from about 80 Hz to 14,000 Hz (which isn't anywhere near full range of 20 Hz to 20000 Hz).
The advantages of using one speaker to cover the all program material is the unparallel imaging and soundstage and true 'point source' sound it produces. Some single driver fanatics go the vintage route, while others choose to go with new speakers. The Ohm A (the largest Walsh speaker ever made) was the only nearly full range speaker ever produced with a response from 30 Hz to 20,000 Hz.