XLogic Multichannel Compressor Owner’s Manual
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
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
4.3Mode Section
This section contains two switches that radically change the operation of the compressor.
MODE
SIDE
CHAIN
SUM
DUAL |
STEREO |
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
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.
4.4Fader 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.
FADER
MASTER
IN |
0dB
| RATE - Secs | ||
|
| 10 | |
| 6 | 30 | |
AUTO | 3 | 40 | |
FADE | |||
|
| ||
| 1 | 60 | |
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