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Figure 23
Figure 24
Figure 25
Place the microphone at the chosen measurement position that is closest
to the speaker under test (where it will measure the highest sound pressure
level). Set the "Input Ch.1" slider to maximum.
Set the "Output" slider to zero and switch on the test signal by
clicking the button. Increase the output level until the "Input Ch.1"
level meter just goes into the red zone. Decrease the "Input Ch.1" level
until the signal peaks between the -6dB and -3dB marks.
Close the "Volume and Input Levels" window and click
switch off the test signal.
Make sure Plot...Overlay is checked to show the frequency response
screen and enable several responses to be viewed simultaneously.
Press the F7 key to bring up the Measurement Settings window. In the
''Levels'' box, set the sine sweep to -40dB FS (full scale).
Perform a number of measurements in different positions by clicking
the
button (or pressing the F2 key). Make the last measurement
you take close to the centre of the listening area and leave the microphone
exactly in that position for subsequent measurements.
Since Plot...Overlay is checked, the curves will be plotted on top of each
other and, when finished, there will be n curves displayed.
In the example shown in figure 22, n = 10.
Click the button to display the mean value on top of all the plotted
curves. The average room response is then calculated (figure 23). This is
the response we want to equalise.
Un-tick all the plots except the mean response. (figure 24)
Press CTRL+ E to save this mean result in the "Tune EQ" folder (if this
folder doesn't exist, create it in C:\Program Files\WinMLS2004\Set EQ).
Then click Save and name the file, for example, Average_resp.txt
(figure 25)
the button to
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