When the sound falls apart at higher volumes

[Ron Nossaman]

> I recall that this phenomenon has been referred to here.  Have a piano 
> in a rather live environment (tile floors, not much on the walls).  At 
> higher volume playing the tone seems to "go out of focus" and gets 
> rough/harsh.  I've wondered about what causes this and what approaches 
> may be used to tame it.

What part of the scale?


> Would adding impedence to the bridge help this?

Specificity - stiffness and/or mass?

Ron N