Sound Booster [Narrow] Acoustic Improvement for Brass Instruments

A set of 2 thin-type 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 one makes the sound resonate more widely.
The silver one sharpens the outline of the sound.
What happens 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 and find your own best fit.

You may be skeptical just by reading the description, but we are confident that you will feel some kind of effect, as many customers make repeat purchases. We hope you will experience it for yourself.

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