Sound Booster [Wide] Acoustic Improvement for Brass Instruments

A set of two thick-type sound boosters that can be used with instruments employing rotary valves.

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 into which 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]. Generally, the larger the size, the stronger the effect. However, a stronger effect is not always better, and 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 encourage you to try various options and find what works best for you.

You may be skeptical just by reading this description, but we are confident that you will experience some 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.