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4.2 STANDARD LOUDNESS SPL CALIBRATION
The Standard Loudness SPL feature allows calibration
of the listening level in accordance with digital loudness
standards such as ATSC A/85 and EBU R128. Calibrated
listening level is important to judge speech intelligibility,
spectral balance, platform compatibility etc.
The in-situ frequency response compensation and sys-
tem alignment should be followed by the absolute SPL
listening level calibration. Note: Digital monitor interfacing
should be used to reduce uncertainty and tolerances.
• Before SPL calibration, first perform the other cali-
bration functions to compensate frequency response,
time of flight, level difference between channels and
sub phase. You would typically do this by creating
a new “Group”, using the Add Group command; or
by editing an existing “Group”, using the Edit Group
command.
• If you require a frequency response other than flat,
for instance an HF roll-off such as x-curve, now make
those adjustments. To edit all channels at once,
consider using the Sound Character Profiler. Per
channel, select and edit individual monitors.
• SPL calibration should be the final item: Click the
‘Group Preset : Standard SPL Calibration’ menu
on the main page. The Standard Loudness SPL
Calibration window opens.
Figure 13. Entering the Standard Loudness SPL
Calibration page.
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