John,
A light came on when I read your response. Before I dwell on this too
much, I want to run a thought by you/group.
Based on your reply, it would seem that a wave trap would also be
effective in this situation. However, many pianos that experience this
'leakage' or 'overring' already have one or more wave traps in place.
At least one (mentioned in subject line) experiences this phenomenon
with a chunk of the soundboard removed.
This is not to challenge your statement, rather to extend the thought.
So, any extended thoughts?
Jim Harvey RPT
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The kind of damping problem you are experiencing may not be related to the
dampers themselves. There are a number of piano designs, large uprights and
squares, that seem to promote poor damping due to the soundboard not the
strings. In these the sound will continue even if all the strings are muted.
I am not sure exactly how this happens but speculate that an area of
soundbaord is either too far from the bridges or insufficiently stiff either
by being too thin or lack of downbearing. In your case maybe the board is
flat and the bearing does not compress the far corners enough.
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