The Threat is another revolutionary invention by Rockie Jacobsen for Rocky Mountain Hunting Calls. With its new V.E.T.T. (Volume Enhanced Tone Technology) system it creates true, easy to obtain elk sounds. This grunt tube comes completely assembled with the spring and adaptor inserted into the tube and is ready to use with your favorite mouth call diaphragm.Read more
V.E.T.T. (Volume Enhanced Tone Technology) System
The V.E.T.T. system contains a spring, tuned to the right dimensions, inside the special made adapter that goes in the small end of the mouth opening of the new style bugle tube. The spring helps create more volume, stabilizes higher notes, raspier low growls and easier octave changes and takes less air to operate. The spring allows for the right amount of vibration to enhance the tone quality and volume that is achieved when blowing into it.