Dead spot

[Newton Hunt]

You are likely experiencing the problem that most pianos have, the
dreaded "killer octave".  The problem, according to those who know how
to fix it, boils down to the soundboard/rib/bridge assembly at that
point is not stiff enough.  The crack has absolutely not effect at all
unless the ribs are unglued there.

The best test is to strike A5, hard, and time it's sustain.  anything
less than 12 seconds is a bead board, anything over 15 seconds is a very
lively board.

You can pluck the strings, hard with a pick or similar tool and listen
to the tone.  If the tone is exactly the same the hammers produce then
there is nothing that can be done short of replacing the soundboard with
one a little better designed.  If the tone _does_ change while plucking
the strings then there are things that can be done to improve the tone.

The idea is that if it is not there you ain't gonna get it.

Happy New Year.

		Newton