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MPX Plus 866 A Media Presentation Matrix Switcher • Switcher Software
5-40
PRELIMINARY
6. In the loudness dialog box, adjust the fader until the value in the “SPL”
readout box matches the reading on the SPL meter.
N
Calibration can be performed with the output channel volume set to any
comfortable listening level, but a relatively loud volume that can be easily
measured is preferred.
Loudness is now calibrated.
7. Release the loudness processor’s bypass to hear the compensation.
Alternatemethod:
N
This method works if 90 dB is an acceptable amplifier/volume limit for the room.
1. Set the loudness dialog box’s Loudness Compensation slider to its default
(center) position and the output channel volume fader to 0 dB (100% volume).
2
. Adjust the amplifier until the SPL meter reads 90 dB. Loudness is now
calibrated.
Setting loudness “by ear”
When setting loudness by ear, it is also essential that the system gain structure be
set up first.
1
. Open the post-matrix loudness processor dialog box.
2. Bypass the loudness processor.
3. Place the meter in an average listening location.
4. Set the output volume fader to a relatively quiet listening level. (Filter
compensation from the loudness processor is most prominent at low listening
levels. Set to the levels described earlier.)
5
. Set the loudness dialog box’s Loudness Compensation slider to its default
(center) position.
6
. Release the loudness processor’s bypass to hear the compensation.
N
You should hear a moderate enhancement to the program material with more
accentuatedbassfrequencies(below500Hz)andmorebrightnessinthehigh
frequenciesthatcarryharmoniccontent(above7kHz).Youcantogglethe
loudness bypass on and off to compare the difference between loudness off and
on.
7
. To experiment with less loudness compensation, move the Loudness
Compensation slider to the left, toward Less.
For more loudness compensation, move the slider to the right, toward More.
8. Any adjustment you make to the Loudness Compensation slider carries
through to all listening levels. Set the DSP Configurator output volume to a
relatively loud listening level.
9
. Toggle the loudness bypass on and off to compare the difference between
loudness off and on. At a loud listening level, this difference should be
minimal, or barely perceivable.