This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment ----- Original Message -----=20 From: BobDavis88@aol.com=20 To: pianotech@ptg.org=20 Sent: Monday, January 20, 2003 2:20 PM Subject: Yow-yow-yowing bass strings Friends, Hep! Hep! (Okay, I grew up in Texas) I don't think I can hep you but I have comments and questions. I'm not sure I know what the sound is. Would you classify it as a = false beat? What rate is it? Is it the same rate for all bad notes? Did = you try tuning it 25 cents sharp and then 25 cents flat to see any = change? A longitudinal vibration will not change frequency with tuning. There is a device I've long wanted to build. It would be a mike fed = to a preamp and a tunable filter connected to a tight fitting fluid = filled head phone. This would allow you to listen for and tune (with = the filter) in the offending sound to identify frequency and possibly = identify the source. There are many uses for this and I now have even = more reasons to build it. Other than that I don't have a clue. Carl Meyer Assoc. PTG Santa Clara, California cmpiano@attbi.com=20 I need an accurate scientific explanation for why SOME single bass = strings go yow-yow-yow, when played by themselves. A new customer I am about to go see, with a new Steinway B, said he = wanted me to maybe replace some bass strings that were "wobbling." I = thought, okay, unisons or voicing, but then he said they were singles. I = realized I had accepted that sound for decades, and just tuned around = it, considering it a shortcoming of shorter scales. Later that day, I = listened to 5 B's, 4 L's, and a D, as well as a 7'4" Boesendorfer. All the Steinways had yowing singles, but not necessarily on the same = notes. Some notes would be clear. The D was the best of the Steinways, = reasonably clear, and the B=F6sendorfer was extremely clean. The Steinways are single-wrapped and the B=F6s is double-wrapped, but = I also listened to some 126 cm Bostons, which are double-wrapped, and = they had random wows too. I've always chalked it up to "inharmonicity" or longitudinal waves or = something like that, but I realized that doesn't really work, and now = it's driving me crazy not to be able accurately to explain this. What is = happening, and why is the B=F6sendorfer so clean? Wobbling in Stockton CA, Bob Davis ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/7c/e5/4b/17/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC