While browsing the internet for various speaker reviews/prices I notice some very expensive speakers with just 2 drivers and sub-$1k speakers with 3 or 4 drivers, both reputable companies, or even 2 models from the same mfg. So in layman's terms what is the difference? How can less drivers sound better or perform better than more drivers?
What is it that makes an inexpensive Wherfadale vs. an expensive Wherfadale (or any other mfg's high-end vs. low/middle end...is there a middle end??

)?
I am new to the world of speakers so forgive my ignorance. I've had a pair of sub $100 Panasonic speakers for 15 years that sound good to my inexperienced ears.
Thanks!
Eddie