Lack of low frequency response

[Richard Brekne]

Hi Dale.

The piano I am looking at in particular has no obvious plate binding... 
and I cant find anything underneath either.... tho I can certainly look 
closer.  But really.... this particular instrument has just jogged my 
mind about a host of instruments I've run into with this basic sound picture

Lets assume for sake of discussion that this is a soundboard 
construction issue.  I'm interested in what different kinds of 
soundboard configurations could cause this.  What would happen for 
example if you took two 12 mm thick soundboards... both with shallow 
wide machine crowned ribs... one board under a lot of compression, the 
other not  ?  And what other kinds of possibilities might cause this 
affect ?

Cheers
RicB


    Yes what Jon P. said
      I've had this anomaly in two pianos.  Each time the top end of 
    the bridge
    was binding against the plate.  However the notes directly below 
    the first
    two or so notes weren't' effected much.  Yours has the  entire bass
    sounding
    odd.  Hmm Check both ends of that bridge.
      Also it can be so many other things. pick one.
     Dale