Can it be a sound upgrade to go from a 3-way system to a woofer and compression driver system?

Hello,

I am currently considering switching from a 3-way system with woofer, midrange and tweeter to a system with one woofer, but the tweeter and midrange are being practically replaced by a compression driver (with a waveguide). For me it has to do with the efficiency of the woofer, which is why I came up with the idea. But I just have the feeling that it will always be a downgrade for the sound if I don't have a real midrange/tweeter driver anymore.
 
It can be an upgrade but depends on many factors (e. g. what kind of 3-way speaker you have, what you want to achieve and so on). After all, the question in this form is too general IMO.
But why not a high efficiency 3-way instead of a 2-way? With a large woofer, a midrange and a compression driver+horn. 🙂
 
it can certainly be an upgrade if the horn+woofer has a uniform polar response that works well in your room.
in general, the less interfering acoustic sources you have, the better - as long as you have enough dynamic headroom (and you will)