Sound Booster [Narrow] Acoustic Improvement for Brass Instruments

A set of two slim-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.

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

The resonance changes depending on which valve you insert the booster into.

It might sound a bit dubious, but please give it a try.

We offer three sizes: [Narrow], [Middle], and [Wide]. The effect tends to become stronger as the size increases, but it's not necessarily 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.