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 rotary valve cap, 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 booster makes the sound resonate more widely.
The silver-colored booster makes the sound's outline sharper.
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 a stronger effect is not always better. 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.

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

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