TC Electronic DB4 MKII - Manual (Page 38)

DMix
34 DB4 / DB8 MKII Algorithms
true-peak limiting performed at 48 bit, fixed point
precision. This enables the downmix gain to be
set freely without worrying about overload or
the loss of resolution. For extra emphasis on the
Center channel, the gain may be run all the way
up to 0.0 dB still without any risk of internal or
output overload.
Surround Gain
Range: Off, -12.0 to 0.0 dB
Downmix gain for the Surround inputs relative
to L and R front. Default Surround gain would
be between -3.0 and -6.0 dB, but DMix employs
a high resolution downmix structure with loud-
ness, 5-band and true-peak limiting performed
at 48 bit, fixed point precision. This enables the
downmix gain to be set freely without worrying
about overload or the loss of resolution. For ex-
tra emphasis on the Surround channels, the gain
may be run all the way up to 0.0 dB still without
any risk of internal or output overload.
Configuration
Select between Stereo, Dual Mono, Stereo Wide,
Sum Mono, Left Mono, Right Mono.
Look ahead Dly
Range: 0 to 15 ms
If the 5 band Compression sections is set to use
a very short Attack times (up to approximately
10 to 15 ms) overshoots may occur. The Look
Ahead function allows the DB8/DB4 to evaluate
the material just before processing and artifacts
can thereby be prevented.
Be aware that the Look Ahead delay function ac-
tually delays the output signal.
Reference level
Range: -24 to 0 dBFS
This parameter defines the 0 dB point for Tar-
get level in the Loudness section as well as the
0 dB point for the Thresholds in the 5-band sec-
tion. It does not, however, affect the threshold of
the output limiter, which is always referenced to
0 dBFS.
Example:
To target an output loudness level of -23.0 LUFS
(the same as -23.0 LKFS), Reference Level could
be set to -23 dBFS and Target Level in the loud-
ness section to
0.0 dB; or you could set Reference at -20 dBFS
and Target Level at -3.0 dB. With the latter set-
ting, the Threshold of the 5-band section would
be 3 dB higher.
To target an output loudness level of -24.0 LUFS
(the same as -24.0 LKFS), Reference Level could
be set to -24 dBFS and Target Level in the loud-
ness section to 0.0 dB; or you could set Refer-
ence at -20 dBFS and Target Level at -4.0 dB.
With the latter setting, the Threshold of the
5-band section would be 4 dB higher.
To target an output loudness level of -27.0 LUFS
(the same as -27.0 LKFS), Reference Level could
be set to -24 dBFS and Target Level in the loud-
ness section to -3.0 dB; or you could set Refer-
ence at -20 dBFS and Target Level at -7.0 dB.
With the latter setting, the Threshold of the
5-band section would be 4 dB higher.
DMix algorithm – loudness page
DMix algorithm – loudness page
Target Level
Range: +10 dB to -10 dB
This is the level the Loudness adjustment section
will aim at. Target Level is relative to Reference
Level on the Main Page. See the Set-up Tip at
the end of the DMix manual about how to fine-
tune this parameter.
Max Reduction
Range: -20 dB to 0 dB
This is the maximum attenuation the Loudness
Control is allowed to perform. If set to 0.0 dB,