Here is something if you hadn't seen it.
https://www.stereophile.com/floorlou...klh/index.html
Have owned stats - and own 20.7s and have listened to the 3.7s on multiple occasions. Here is my opinion.
Maggie's give you detail. You will hear all of the silverware.
here is where they shine - in particular the 20s - texture / timbre/ natural sounding bass into the mid 20s. So you get the detail - but you also get more body and more warmth to the sound without getting muddy. The bass doesn't come at you like a cone. Think of it as a bass drum just reverberating throughout the room like a real drum would. Not a piston firing bass at your chest. The bass is 'bloomy' not 'punchy'..
I will say - their sound changes more than any speaker I have listened to based on room placement.
Having never heard the KLH - I can't comment on them. All I can do is give you a relative feel for the Maggie sound.
I love my 20.7s (can you tell?).
