Figure 5 - An example of a good sound chamber
The
fl
oor and walls in Figure 5 are covered in soft, absorbing surfaces (1.75 inch foam
padding) with signi
fi
cant damping power. The speaker and subject are aligned slightly off-axis
with the wall to maximize scattering.
Figure 6 - An example of a bad sound chamber
The speaker orientation in Figure 6 is an example of poor sound chamber preparation for two
reasons. First, the speaker is angled directly at the
fl
oor, so the stimulus will be re
fl
ected
The external shell is metallic and tied to earth ground, which doubles as a Faraday cage that will shield against
electromagnetic radiation.
Important
Sound Chamber Fundamentals | 53
