Actually I find the high and low end very coherent (as you'd expect from a single driver) and very well balanced. The balance actually very organic and correct.
And I don't find the output to be strained for the size of room they're in (15X20). My only real gripe is that they're on the tonally bright side - and the tweeters don't seem quite as refined as I'd like. The tweeters could continue to improve dramatically with further break in however.
But I'm not being fair either. I'm comparing this monitor speaker to high end floor standers I'm used to and hoping they'll do something similar for a fraction of the price.
Taking these for what they are; essentially monitors - you almost couldn't ask for more. Incredibly coherent 3D sound with amazing sound staging, imaging depth etc.
In fact after having the LS-50's in my system, I've come to hear how really good and capable my Cary Audio solid state amp is. I've had a prettier and richer sound from my former speakers, but never heard the kind of speed, nuance, air, imaging and staging I hear with the LS-50.
Yes the tonal balance is brighter than I prefer - that's how monitors are. Studio engineers need to hear every nuance and detail. Is it the fault of the LS-50's that they don't deliver the sound I'm used to from an entirely different type of speaker?
Not at all. In terms of a monitor speaker I'd give these an A+. The plus is because these also deliver a musicality, dynamic and involvement factor you don't usually get from even the best monitor speakers.