WOW...I find this of interest as the piano in question for me is a Knabe 6' ..don't know the #..a friends wife owns it.. (it is new last fall) ..., and I go over to play Mozart Sonatas..(one piano, four hands) and I noticed it right away...It then, MUST be louder on the Knabe, or I would have heard it on other makes I have played recently, seems to me, as I am looking for a new small grand...Thanks, John ContP.S. Everyone picks on me for going over to play with my friends wife.... (Love the cross-hand passages...)