I apologize for coming into this discussion late. IMO there are a very few good single-driver speakers on the market, although not many that are well known. Limitations? Yes, but different and no more than with most "conventional" speaker designs.
One speaker manufacturer that offers an interesting product is EARO, made in Sweden. These are single driver ACTIVE speakers featuring a rear-loaded horn. There are two models, one with an 8" driver and the other using a 5" driver. Frankly, I think that these are among the finest sounding speakers I have ever heard.
*Disclaimer* I am the U.S. dealer for the EARO speaker line. I actually purchased a pair for myself before I decided to sell the line.
One speaker manufacturer that offers an interesting product is EARO, made in Sweden. These are single driver ACTIVE speakers featuring a rear-loaded horn. There are two models, one with an 8" driver and the other using a 5" driver. Frankly, I think that these are among the finest sounding speakers I have ever heard.
*Disclaimer* I am the U.S. dealer for the EARO speaker line. I actually purchased a pair for myself before I decided to sell the line.