1. Markus Schneider - FH-Regensburg
Acoustics of the Cajon
Markus Schneider - FH-Regensburg

2. Content History Acoustic System of the Cajon – Overview Plate
Helmholtz Resonator
Other Resonators
Equipment

3. History Origin in Peru The first instruments were shipping boxes
“Cajon” is the Spanish word for box
Adopted by Cuban flamenco percussionists

4. Acoustic System - Overview
Plate with clamped edges
Helmholtz Resonator

5. Plates – Modes of vibration 1
Theory
Simulation
Recorded Video
Fundamental
Mode
(0,1) Mode

6. Plates – Modes of vibration 2
Theory
Simulation
Recorded Video
Fundamental
Mode
(1,0) Mode

7. Helmholtz-Resonator Calculation FFT
C: Speed of waves in air r: Radius of the hole V: Volume of the body
Dominant frequency : 160 Hz

8. Other Helmholtz Resonators
Exhaust system
Loudspeaker
Body of other musical instruments

9. Equipment Acoustic Camera  33 microphones “make sound visible”
Software  NoiseImage
Equipment can be seen at FH-Regensburg  Mechanical Engineering

10. Thank you for your attention!
Markus Schneider - Acoustics of the Cajon