The measurement of interzone attenuation demonstrates the sound reflective characteristics of ceiling systems when used in conjunction with partial-height space dividers. This arrangement is commonly used in offices in order to achieve speech privacy between working places.
1. Plenum
2. Ceiling test specimen
3. Loudspeaker
4. Reference location (source)
5. Screen
6. Measurement positions
The measurement set up for interzone attenuation is fixed with a defined layout, a given 1.5 meter high space divider and defined positions for source and receiver. The interzone attenuation is calculated as the difference in sound pressure level between source and receiver for each one-third octave band in the frequency range 200-5000 Hz and at each distance.