Dealers and exaggerated treble

I've been thinking about some negative experiences I've had at dealers over the past few years. I don't mean the dealer's were unpleasant, they were not. I mean that I heard bad sound.

In a lot of those cases, the treble was exaggerated, or harsh to me.

I'm wondering, have you ever heard really bad treble at a dealer, but then you hear the speakers elsewhere and they seem fine?
@testpilot  I am talking about one channel being out of phase with the other.  
Even some speaker manufacturers over-emphasize the treble and fool the audience into thinking they are hearing extra air and detail -- but they are not; furthermore, when they get the speakers home, they find that they give them listening fatigue.
I’m Lucky to have two good dealers near me. AudioLab in Fairless Hills, PA and The Art of Sound in Lambertville , NJ