Sound Booster [Middle] Acoustic Improvement for Brass Instruments

A set of two sound boosters for instruments with rotary valves, in a medium size.

As shown in the example, open the rotary valve cap, place the booster inside, and then close the cap.
This alone will change the way the sound resonates.
For bass trombone players, changing the valve where the booster is inserted will also alter the resonance.

The gold-colored booster makes the sound resonate more widely.
The silver-colored booster sharpens the sound's definition.
What happens if you use both...

We offer three sizes: [Narrow], [Middle], and [Wide]. As the size increases, the effect tends to become stronger, 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 provides a different kind of resonance.
We hope you will try various options to find your personal best.

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.