| Sound posts are adjustable length posts that you can place on your horn between two pieces of tubing such as the lead pipe and the lower pipe going into the third valve, or the leadpipe and the bell. They have little "U" shaped ends so that they hug the tubing, then you tighten it up with the adjustment screw in the middle.
The theory behind sound posts is that you can tweak and adjust the resonance of your horn by placing the sound post on vibration nodal points to brighten or darken the sound of your horn. I've never used one but a friend of mine had one and really liked what it was doing for him.
By the way, if I'm not accurate on my assesment, feel free to make additions or corrections. |