TC Electronic DB4 MKII - Manual (Page 43)

DMix
English Manual 39
levels, e.g. when preparing film or concerts for
domestic or noisy environment listening.
Try setting the Steer and/or Threshold param-
eters differently in the bands to hear the effect.
High Steer values add more detail gain than low
values, but remember that Threshold has to be
negative to add detail gain at all.
DXP Threshold relates to the Reference Level set
on the Main page.
To disable DXP detail gain at very low levels, use
the Defeat Threshold and Defeat Ratio controls.
Defeat threshold relates to the DXP threshold,
and allows for a certain level-window, inside
which detail gain is applied. Defeat Ratio deter-
mines the slope at which DXP detail gain is de-
feated.
DMix algorithm – limit page
DMix algorithm – limit page
Link Limiter
When Link is active, the same amount of peak
limiting is always applied to both channels.
Some broadcasters like the sound of operating
left and right limiting without stereo coupling be-
cause they feel that it maximizes loudness and
widens the stereo image. On dual mono sources,
of course you should always choose unlinked
Limiter operation.
The Configuration control on the Main page does
not affect the Link Limiter setting. This link is run-
ning individually from the selected configuration.
Softclip L/R
Range: -3 dB to Off
When active, Soft Clip applies a saturation ef-
fect on signals close to maximum Output level.
The threshold is relative to the Threshold of the
Brickwall Limiter.
This controlled distortion of transients works well
for adding loudness, but is not a desirable effect
with some data compression codecs. While the
Brickwall Limiter is extremely low distortion, Soft
Clip is not. Use your own judgement if you want
it or not.
Threshold L/R
Range: -12 to 0.0 dBFS
Sets the Threshold of the Brickwall Limiter.
The Threshold is relative to 0 dBFS, not to the
Reference Level set on the Main page.
The output limiter detects and protects against
true-peak signals as defined in ITU-R BS.1770,
ITU-R BS.1770-2 and in EBU R128. This preci-
sion limiter is based on 48 bit processing and
utilizes adaptive time constant for low distortion
operation.
Fader
Range: Off to 0 dB
Fader function on the Output. When Dual Mono
configuration is selected, individual Output fad-
ers are available.
Setup tips
DB processors feature precise ways to probe
the current loudness status of a station. When
deciding the amount of processing needed, it’s
suggested to load an LM6 loudness meter on the
input and one on the output of DMix. After a few
days, you will have a picture of how much input
and output loudness fluctuates. This should trig-
ger advice to production from time to time, and
maybe adjustments to delivery specifications or
normalization procedures.
Note: When reading LM6, remember that units
“LKFS” and “LUFS” are the same (besides from
the letter “K” vs. letter “U”). A Program Loudness
reading of, for instance, -25.3 LUFS, is precisely
the same as -25.3 LKFS.
The goal should be an ever improving and pre-
dictable loop, spanning from production to distri-