Sound Booster [Middle] Acoustic Improvement for Brass Instruments

A set of two medium-sized sound boosters for instruments with rotary valves.

As shown in the example, open the cap of the rotary valve, place the booster, and then close the cap.
This alone will change the way the sound resonates.
Changing the valve where the booster is inserted will also change the resonance.

The gold-colored ones will make the sound resonate more widely.
The silver-colored ones will make the sound's outline sharper.
What if you use both...

We offer three sizes: [Narrow], [Middle], and [Wide]. The effect tends to become stronger as the size increases, but it's not always better to have a stronger effect; the optimal condition varies depending on individual condition and compatibility with the instrument.
We also offer a [Powerful] type, which has a different resonance.
We hope you will try various options to find your own best fit.

*Please note that the perceived effect may vary from person to person.