Report Could installing a narrower bridge cure a wolf note on a Violin? in The Pegbox Posted Monday at 08:48 PM 5 hours ago, Bodacious Cowboy said: I think this is already well understood by those who know about these things. My (undoubtedly flawed) understanding is that the "force window" for clean Helmholtz motion of the bowed string is significantly smaller for a heavy string stopped at a high position. So it's more readily disrupted by the vibrational body mode responsible for the wolf tone. I guess someone like Marty will be able to give a more authoritative/rigorous explanation. Your explanation is fine. Professor Jim Woodhouse gave a video presentation on the wolf note for the Oberlin Acoustics Workshop last Summer :https://www.youtube.com/watch?v=gTaOtKuWAHA His presentation avoids any math stuff and is only about 45min long. The subsequent question and answer discussions are informative too. I should point out that Jim has also made instruments so he has a practical feel for the problems. If you want more math detail on the "force window" for Helmholtz motion I suggest section 9.3.1 of Woodhouse's online book: euphonics.org He has suggested an easy way of reducing the severity of a wolf note is to use a lighter tension string which reduces the minimum bow force needed.