PRELIMINARY
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44
initial position. If using the
Sofa
or
Auditorium
listening environment, again spread the measurement locations
over the full listening area and vary microphone height by a significant amount.
You should feel to adjust the locations depending on the circumstances
–
for example, so avoid placing the
microphone in the “shadow” of a seat back.
The important thing is to ensure that the measurement locations
are spread out over the whole listening area and that the microphone is moved vertically as well as horizontally.
5.6.3
Execute a measurement
With the microphone in place at the central location and pointed vertically (towards the roof), click on the
Start
button. The
C-DSP 8x12 DL
will generate a test signal, audible as a frequency sweep through the front left
speaker, then the right front, and so on through all channels. Finally, the frequency sweep plays through the left
speaker again.
While the measurement proceeds, the time-domain response graph of the captured audio signal is displayed at
the bottom of the measurement tab. (This graph is related to the magnitude response but is not the same
display. Its purpose is to verify that the recorded signal level is in a suitable range.)
