----- Original Message ----- From: <Duplexdan@AOL.COM> To: <pianotech@ptg.org> Sent: November 02, 2001 4:27 PM Subject: Re: Was Voicing M&H BB/ Now tuned duplexes > 3. BuzZing duplexes. If by testing it can be ascertained that the duplex > portion of the string is causing a buzz, the simplest remedy is of course to > mute it. However, I have never heard or seen any scientific data or > experiment that proves that tuning the duplex causes the buzz. I highly doubt > it. Dan, Tuning the duplex does not cause any buzzing by itself. It is the string geometry that must be used to get the aliquot system to work that makes the system susceptible to buzzing. Nearly every string buzzing problem I've ever encountered in a grand piano has been in one with a tuned duplex system. We make the piano relatively immune to string buzzing by increasing the string deflection angle and shortening the duplex string length. In the process we also increase sustain time noticeably. Del
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