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MMD > Archives > August 1996 > 1996.08.29 > 03Prev  Next

Nodal Ringing
By John A. Tuttle

Hi all,

For the past few years I have been modifying the dampers on upright pianos in an effort to reduce nodal ringing in the low tenor region (tri-chords).

The methodology is the same one utilized in grand pianos. Simply split the damper into two pieces. I have had 100% success with this procedure and so I thought I should pass the information around. As a precursor, I always square the damper head to the strings as best as reasonably possible. (I don't use a micrometer.) For the really troublesome notes nearest the break, I do use tri-chord dampers but I also cut a "V" out of the center so that there are two definite points of contact.

The attached bit map is for example only.

Musically, John Tuttle

[ Ed. Note: John, thanks for the drawing "DAMPER.BMP". I'll save it
[ for placement in the archive when Jody returns. -- Robbie

(Message sent Thu 29 Aug 1996, 15:22:57 GMT, from time zone GMT-0400.)

Key Words in Subject:  Nodal, Ringing

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