Solid State Logic XLOGIC 82S6XL010D User Manual
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The ISO switches isolate their respective channels from the compressor. When pressed that channel will
not contribute to the side chain and will not be affected by the compressor. It is still controlled by the
Master Fader and AutoFade controls.
Another example may help: your mix has low level stereo reverb placed in the surround channels. You
don’t want this to be affected by the front channels so you press the Surround ISO switch in.
The LFE LINK switch links the LFE channel to the main compressor - effectively turning the unit into a
single six channel compressor. This is useful if you want the LFE channel to be compressed with the main
mix. Turning down the LFE S-CHAIN TRIM control will stop the LFE signal compressing the rest of the
mix.
Alternatively (provided the LO PASS FILTER switch is released and the LFE 0DB switch is pressed) the
LFE channel can be used as a sixth full bandwidth channel for compressing the 6 main channels of a 6.1
mix.
The LFE LO PASS filter switch inserts a 120Hz low pass filter in the LFE side chain. This is useful if the
LFE channel is full bandwidth (if it is derived from the LCR channels for example) and prevents the low
frequency content being over compressed by higher frequency material.
Material that has been mastered for Dolby Digital™ or Dolby AC3™ release has the LFE level reduced by
10dB, as Dolby specify a gain of 10dB in the LFE speaker channel relative to the other channels. The LFE
side chain has 10dB more gain than the other channels to compensate for this. Other release formats (SACD
for example) run the LFE channel at the same level as the other channels. The LFE 0DB switch sets the LFE
side chain to the same gain as the other channels.
The MAX display consists of 6 bi-colour LEDs. These light yellow to show signal present (at approximately
-36dBu). When the compressor is active the LED corresponding to the channel that is applying the most
gain reduction will turn red.
4.3
Mode Section
This section contains two switches that radically change the operation of the compressor.
The DUAL STEREO switch reassigns the controls so that the lower set control the surround
channels and the upper set control left, centre, right and LFE channels. This can be used either
to provide separate compression of the surround channels or to allow the unit to be used as two
separate compressors (one 4-channel, one stereo) when working on stereo material.
In normal operation the loudest signal will drive the compressor. With some material this may
not give the desired effect – if the lead guitar is panned to all five speakers it may well be the
loudest thing in the mix but not be the loudest thing on any one speaker channel. The SIDE
CHAIN SUM
switch changes the operation of the compressor so that the side chain is derived
from a sum of the input signals. These are summed after being rectified to avoid phase
cancellation effects. In this mode the SIDE CHAIN TRIM trim controls control the contribution
of each input to side chain.
Note that if the LFE LINK switch is selected in this mode the LFE channel will be controlled by the upper
compressor but will not contribute to its side chain.
4.4
Fader Section
The final part of the compressor is the output fader section which provides overall
level control of the mix. This has two parts:
• The MASTER fader and its associated IN switch provide overall level control of the
mix. When the IN switch is off the fader control has no effect.
• The AUTOFADE switch and associated rotary control provides a timed fade down
or up with a fade time of 1 to 60 seconds. Pressing the switch will fade out the audio
in the time set on the associated control and releasing the switch will fade the audio
back up in the same time - the fade time can be adjusted at any time. The
AUTOFADE
switch will be illuminated whilst the signal is fading down and will
remain illuminated until the signal has returned to normal gain.
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XLogic Multichannel Compressor Owner’s Manual
DUAL
STEREO
SIDE
CHAIN
SUM
MODE
FADER
AUTO
FADE
RATE - Secs
1
3
6
10
30
40
60
IN
MASTER
0dB