TC Electronic DB6, Manual

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Loudness Wizard
English Manual (2014-03-05) 49
respond to the channel weighting as defined in
BS.1770.
When the ALC Target parameter on the Weight
page is set to
Downmix, the five channel param-
eters serve as downmix coefficients for the Main
channels. Typical downmix gains would be 0 dB
for L and R, -3 dB for Center, and between -3
and -6 dB for Surrounds.
LFE section
Weighting parameter
Use the Weighting parameter to set whether or
not the LFE level should be taken into account
when loudness is adjusted by the algorithm.
The setting shown here corresponds to the de-
fault BS.1770 condition where LFE does
not in-
fluence loudness measurements.
LFE Process parameter
Use the LFE process parameter to specify
whether the LFE channel should follow loudness
adjustments of the Main channels (Main link set-
ting) or not (Bypass setting).
Mode section
ALC Target parameter
Use the ALC Target parameter to specify wheth-
er 5.1 loudness adjustment should be based on
measurements of the actual 5.1 signal (“5.1 For-
mat”), or based on a subsequent stereo down-
mix (“Downmix”).
Please note that Downmix loudness is not al-
ways the same as when the program is heard in
5.1. If a majority of a station’s listeners use mono
or stereo speakers, the Downmix setting leads to
greater listener satisfaction.
Loudness Wizard – ALC page
Loudness Wizard – ALC page
Loudness section
Target Level parameter
Use the Target level parameter to set the tar-
get level for Loudness adjustment. For DTV, the
parameter is typically set to -23 or -24 LKFS =
LUFS.
Stereo Offset parameter
If there are systematic level differences between
native stereo and native 5.1 programs, you can
use the Stereo Offset parameter to limit these
differences.
Max Reduction parameter
Use the Max Reduction parameter to define the
maximum amount of negative gain correction
that can be applied by the loudness adjustment
section – regardless of other settings. The pa-
rameter range is from -20 to 0 dB.
Max Boost parameter
Use the Max Boost parameter to define the max-
imum amount of positive gain correction that can
be applied by the loudness adjustment section –
regardless of other settings. If this parameter is
set to 0 dB, level boost is disabled.
Avg. Rate parameter
Loudness adjustment makes use of several
signal-adaptive time-bases. To make the timing
systematically faster or slower, adjust the Avg.
Rate parameter (specified in dB/s).