Box Instruments as of Resonant Box Kalimba
Box Instruments, such as Resonant Box Kalimbas, are great choices among other instruments.
This sort of Kalimba develops from flat board version. There are always sound holes in the front and on the back of the body.
Thanks to the resonant box, the sound is significantly louder.
You are free to apply Wha-Wah sound technique. It can lead you to play kalimba into next level.