CLIOwin 7 PCI User's Manual - Audiomatica

15.5 NOTES ABOUT ACOUSTICAL PARAMETERS MEASUREMENT
This paragraph gives some guidelines that should be followed while executing the
measurement of the impulse response of rooms; what said here should be considered
together the general procedure that is described in chapter 10 for executing MLS
measurements.
The sound source shall be as omni-directional as possible. Maximum acceptable
deviation from omni-directionality should not be higher than ±1dB up to 500Hz, ±3dB
at 1kHz, ±5dB at 2kHz, ±6dB at 4kHz when excited with octave bands noise and
measured in a free field.
Regarding measurement positions it is important to execute an adequate number of
measurements with different source and receiver positions to characterize the entire
room. For large auditoria a number of measurements from 6 to 10 in dependance of
the number of seats (from 500 to 2000) should be carried out.
The microphone should be placed at a height of 1.2m above the floor at audience seat
locations to be representative of listener’s ear height.
Chapter 15 - Acoustical Parameters 183