For low volume and music where powerful bass and high frequency are not important (or if you are an old fart who can't hear those high frequencires) a single driver can be a good choice.
However, although a full range speaker is called "single driver" I question the appropriateness of this name. The high frequency response is enabled by cone breakup where the small center area of the cone vibrates independently of what the rest of the cone is doing. Many full range drivers have "whizzer cones" to enhance this behavior. One might say that the driver really consists of a woofer area and a tweeter area, driven by a common voice coil. It is very tricky (some say impossible) to get this to sound right. You need to design a mechanical filter for the crossover, and this is a lot more difficult than an electronic one. Personally I prefer my tweeters to have their own voice coils.
Interestingly, my Magneplanar MG1.6 speaker somewhat resemble full range speakers, because the tweeter is just one area of the same mylar diaphram that serves as woofer. However, that tweeter area does have its own independent drive wires.
However, although a full range speaker is called "single driver" I question the appropriateness of this name. The high frequency response is enabled by cone breakup where the small center area of the cone vibrates independently of what the rest of the cone is doing. Many full range drivers have "whizzer cones" to enhance this behavior. One might say that the driver really consists of a woofer area and a tweeter area, driven by a common voice coil. It is very tricky (some say impossible) to get this to sound right. You need to design a mechanical filter for the crossover, and this is a lot more difficult than an electronic one. Personally I prefer my tweeters to have their own voice coils.
Interestingly, my Magneplanar MG1.6 speaker somewhat resemble full range speakers, because the tweeter is just one area of the same mylar diaphram that serves as woofer. However, that tweeter area does have its own independent drive wires.