The Chrome Double Bass Wolf Note Eliminator is a small chrome plated steel weight that attaches to the string and changes the resonance. It is used to eliminate wolf tones on Double Basses.
You need to experiment to find the best string and position. It is easy to put on, just remove the inner lining and put it on the string, turn the opening and then slide the metal sleeve over it, tighten both the screw and the lock nut.
What is a Wolf Note?
A wolf note, or simply a wolf, is a noise that is produced when a note played on a stringed instrument matches the natural resonating frequency of the instrument, producing a tone that is loud and harsh and basically unwelcomed by most musicians.
Wolf notes are usually only noticed on bowed instruments, most notably the violin and surrounding family, since the tones produced are played for much longer periods and thus are easier to hear. Frequently, the wolf is present on or in between the pitch E and F.
A wolf can be eliminated with a piece of equipment called a wolf note eliminator. This is a metal tube and mounting screw with an interior rubber sleeve that fits around the offending string below the bridge.
Different placements of this tube along the string influences or eliminates the frequency at which the wolf occurs. It is essentially an attenuator that cuts down on the odd reverberation.