TC Electronic DB2, Руководство пользователя

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5-BAND PAGE
Introduction
Multi-band processing can be used for evening
out spectral differences between programs,
optimizing levels and/or assisting the loudness
correction when changes in loudness occur
suddenly. Make your settings on the 5-band
pages according to the task at hand.
The 5-band processor in DB2 may be used
simultaneously with all other processing
modules. The section may be switched to four,
three or two bands or to “DXP” mode, which
lifts low-level signals instead of performing
regular multi-band compression.
Pressing Threshold, Range, Ratio, Attack and
Release buttons will immediately assign Lo,
Mid, Hi and All values for these parameters to
Faders 1 to 6.
The “All” parameter offers a relative adjustment
of all bands. Its value reflects that of the Mid
band.
Threshold
Range: -25 dB to +20 dB
Use this parameter to set the threshold for each
frequency band in the compressor. Values are
relative to the Reference Level parameter on
the Main page.
Gain
Range: 0.0 to 18 dB in 0.1 dB steps.
Use this parameter to apply make-up gain to
each frequency band. The gain is reflected on
the 5-band meter on the Icon remote, thereby
giving an idea of the frequency response of
DB2 when levels are below the threshold of
compression.
Ratio
Range: Off to Infinity
Use this parameter to set the ratio for each
frequency band in the compressor.
Attack
Range: 0.3 to 250 ms
Use this parameter to set the attack time for
each band of the compressor.
Release
Range: 20 ms to 7 sec.
Use this parameter to set the time it takes for
each compressor band to recover to unity gain.
Bypass Comp.
Click to this button to bypass the 5-band com-
pressor.
Xovers
Click this button to access the four cross-over
points between the five bands. The parameters
are automatically assigned to faders 1 to 4.
Parameter Range:
Xover 1: Off to 1.6 kHz
Xover 2: Off to 4 kHz
Xover 3: 100 Hz to Off
Xover 4: 250 Hz to Off
Defeat Thresh
Range: -3 to -30 dB
This is a unique control which defeats gain
from the multiband compressor below a certain
threshold. No matter what spectral shaping is
applied from the multiband system: Below the
Defeat Threshold, the frequency response is
flat and gain is unity.
Defeat Threshold is relative to Compressor
Threshold, which is relative to Reference Level.
Defeat Ratio
Range: Off to Infinity
Controls how close to the Defeat Threshold the
make-up gain of the compressor is counter-
acted. At high ratios, the signal only has to be
slightly below the Defeat Threshold before the
compressor gain is fully defeated.
5-BAND PAGE
DXP Mode – Introduction
The 5-band section works either in normal com-
pression mode or in DXP (“Detail Expansion”)
mode. Instead of attenuating signals above a
certain threshold, DXP mode lifts up signals
that are below the Threshold; thereby bringing
out details rather than squashing the loud parts.
DXP mode therefore is capable of adding intel-
ligibility and air to speech, lifting harmonics,
or emphasizing ambience without increasing
overall peak level.
As shown in the illustration, gain is positive
below threshold, unity at Threshold, and the
effect decreases above Threshold. In DXP
mode, Ratio becomes Steer. Steer can be
regarded as an adaptive Ratio that gradually
approaches 1:1 above the threshold.
Multiband DXP
DXP mode can be used with any number of
bands (up to five). Multiband DXP is particularly
effective in bringing out air and clarity.
The processor can act as an automatic EQ that
removes a boost when it’s not needed: at very
low levels (where noise is dominant) and at
loud levels (where sibilance would become a
problem). Apart from being effective on speech,
DXP mode can also be used in mastering to
bring up low 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 determines the
slope at which DXP detail gain is defeated.