Solid State Logic Air Compressor 82S6XL010D User Manual

Multichannel Compressor  
Owner’s Manual  
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Solid State Logic  
S U P E R A N A L O G U E  
M U L T I C H A N N E L  
C O M P R E S S O R  
Super-Analogue™ Outboard  
Owner’s Manual  
82S6XL010D  
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XLogic Multichannel Compressor Owner’s Manual  
Solid State Logic  
Begbroke, Oxford, England, OX5 1RU • +44 (0)1865 842300  
320 West 46th Street, 2nd Floor, New York, NY 10036, USA • +1 (1) 212 315 1111  
Suite 401, 5757 Wilshire Blvd, Los Angeles, CA 90036, USA • +1 (1) 323 549 9090  
3-55-14 Sendagaya, Shibuya-Ku, Tokyo 151-0051, Japan • +81 (0)3 5474 1144  
7 bis, rue de la Victoire, le Blanc Mesnil, Paris 93150, France • +33 (0)1 48 67 84 85  
Via Timavo 34, 20124 Milano, Italy • +39 (0)39 2328 094  
© Solid State Logic  
All Rights reserved under International and Pan-American Copyright Conventions  
Solid State Logic, SSL and XLogic are trademarks of Solid State Logic  
All other product names and trademarks are the property of their respective owners  
No part of this publication may be reproduced in any form or  
by any means, whether mechanical or electronic, without the  
written permission of Solid State Logic, Oxford, England  
Revision 0A, September 2003  
Revision 0B, January 2004  
Revision 0C, June 2004  
Revision 0D, July 2004  
Minor changes, November 2004  
Minor changes, June 2005  
As research and development is a continual process, Solid State Logic reserves the right  
to change the features and specifications described herein without notice or obligation  
E&OE  
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Contents  
1.0 Introduction  
3
2.0 Safety Considerations  
Safety Warnings  
4
4
3.0 Installation  
6
6
6
6
Setting the mains voltage selector  
Mounting  
Connections  
4.0 Operation  
7
7
7
8
8
Compressor Controls  
Side Chain Adjust Section  
Mode Section  
Fader Section  
Appendices:  
A
B
Internal Links and Fuses  
Connector Details  
9
9
C
D
E
Electronic Specification  
Calibration Instructions  
Physical Specification  
Environmental Specification  
10  
11  
13  
13  
F
Page 1  
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XLogic Multichannel Compressor Owner’s Manual  
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oig  
XL  
Page 2  
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Introduction  
1.0 Introduction  
The XLogic Multichannel Compressor is a 2U rack-mounting six-channel compressor. It utilises classic SSL  
Centre Section compressor design elements within a SuperAnalogue design topology. This brings the dual  
benefits of spectacular surround audio performance with a universally acclaimed compressor characteristic.  
The unit contains two separate compressors. Normally the upper one controls the left, centre, right and surround  
channels and the lower one the LFE channel, but 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.  
The SIDE CHAIN TRIM controls allow different thresholds to be set for left/right, centre, surround and LFE  
channels. The centre and surround ISO switches bypass the respective compressor channels completely.  
A six channel Master Fader and Autofade control provide overall level control of the mix  
The object of this manual is to provide purchasers of the XLogic Multichannel Compressor unit with information  
in the following areas:  
• Operation of the unit  
• Safety considerations  
• Installation requirement  
• Electrical connections and cabling  
• Connector pin-outs  
• Specifications and physical dimensions  
Warranty  
The warranty period for this unit is 12 months from date of purchase.  
In Warranty Repairs  
In the event of a fault during the warranty period the unit must be returned to your local distributor who will  
arrange for it to be shipped to Solid State Logic for repair. All units should be shipped to Solid State Logic in their  
original packaging. Solid State Logic can not be held responsible for any damage caused by shipping units in  
other packaging. In such cases Solid State Logic will return the unit in a suitable box, which you will be charged  
for. Please do not send manuals, power leads or any other cables - Solid State Logic can not guarantee to return  
them to you. Please also note that warranty returns will only be accepted as such if accompanied by a copy of the  
receipt or other proof of purchase.  
Out of Warranty Repairs  
In the event of a fault after the warranty period has expired, return the unit in its original packaging to your local  
distributor for shipment to Solid State Logic. You will be charged for the time spent on the repair (at Solid State  
Logic's current repair rate) plus the cost of parts and shipping.  
Page 3  
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XLogic Multichannel Compressor Owner’s Manual  
2.0 Safety considerations  
This section contains definitions and warnings, and practical information to ensure a safe working environment.  
Please take time to read this section before undertaking any installation work.  
2.1 Definitions  
‘Maintenance’  
All maintenance must be carried out by fully trained personnel. Note: it is advisable to observe suitable ESD  
precautions when maintenance to any part is undertaken.  
‘Non-User Adjustments’  
Adjustments or alterations to the equipment may affect the performance such that safety and/or international  
compliance standards may no longer be met. Any such adjustments must therefore only be carried out by fully  
trained personnel.  
‘Users’  
This equipment is designed for use solely by engineers and competent operators skilled in the use of professional  
audio equipment.  
‘Environment’  
This product is a Class A product intended to form an integrated component part of a professional audio  
recording, mixing, dubbing, film, TV, radio broadcast or similar studio wherein it will perform to specification  
providing that it is installed according to professional practice.  
2.2 Electrical Safety Warning  
When installing or servicing any item of Solid State Logic equipment with power applied, when cover  
panels are removed, HAZARDOUS CONDITIONS CAN EXIST.  
These hazards include:  
High voltages  
High energy stored in capacitors  
High currents available from DC power busses  
Hot component surfaces  
Any metal jewellery (watches, bracelets, neck-chains and rings) that could inadvertently come into contact  
with uninsulated parts should always be removed before reaching inside powered equipment.  
2.3 Installation  
Voltage Selection and Fusing  
All XLogic units have selectable voltage inlets. Always confirm that the input mains voltage range is set correctly  
before applying power. Always isolate the mains supply before changing the input range setting.  
If it is ever necessary to replace a blown mains fuse, then always use the correct rating and type of replacement.  
If a correctly rated fuse continues to blow, then a fault exists and the cause should be investigated or the unit  
returned to Solid State Logic for repair/replacement as appropriate.  
Details of mains settings and correct fuse ratings can be found in Section 3.1 and Appendix A of this manual.  
Safety Earth Connection  
Any mains powered item of Solid State Logic equipment that is supplied with a 3-core mains lead (whether  
connectorised or not) should always have the earth wire connected to the mains supply ground. This is the safety  
earth and grounds the exposed metal parts of the racks and cases and should not be removed for any reason.  
Page 4  
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Safety Considerations  
Mains Supply and Phases  
Solid State Logic equipment is designed for connection to single phase supplies with the Neutral conductor at  
earth potential – category TN – and is fitted with a protective fuse in the Live conductor only. It is not designed  
for use with Phase (Live) and Neutral connections reversed or where the Neutral conductor is not at earth  
potential (TT or IT supplies).  
Mains cables will be coded with the following colour scheme:  
LIVE:  
Brown  
NEUTRAL:  
EARTH:  
Blue  
Yellow/Green  
Mains Isolation and Over-Current Protection  
An external disconnect device is required for this equipment which must be installed according to current wiring  
regulations. A detachable power cord, as fitted to this equipment, is a suitable disconnect device.  
An external over-current protection device is required to protect the wiring to this equipment which must be  
installed according to the current wiring regulations. The fusing or breaking-current are defined in the product  
specification. In certain countries this function is supplied by use of a fused plug.  
CE Certification  
Note that the majority of cables supplied with SSL equipment are fitted with ferrite rings at each end. This is to  
comply with current European CE regulations and these ferrites should not be removed.  
If any of the unit metalwork is modified in any way this may the adversely affect the CE certification status of  
the product.  
FCC Certification  
The XLogic unit has been tested and found to comply with the limits for a Class A digital device, pursuant to part  
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference  
when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate  
radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause  
harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause  
harmful interference in which case the user will be required to correct the interference at his own expense.  
Page 5  
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XLogic Multichannel Compressor Owner’s Manual  
3.0 Installation  
3.1 Voltage Selection  
Before connecting the mains supply ensure that the  
voltage range selector next to the IEC socket on the rear of  
the unit is correctly set. The input setting must be  
confirmed before applying power. The input module can  
be configured to be one of 4 voltage settings. The setting  
is indicated by a plastic pin protruding through the  
appropriate hole in the fuse panel - the example shown here is set for 240V operation.  
100V  
120V  
230V  
240V  
The setting is altered by a small vertical PCB which can be fitted in 4 positions. To change the setting:  
• Switch off and remove the IEC lead.  
• Using a small flat-bladed screwdriver, lever open the fuse panel to the right of the connector.  
• At the right hand side is a vertical PCB with a plastic key which indicates the setting. Using pliers, pull  
out the PCB.  
2 4 0  
• The PCB has to be rotated until the  
desired voltage is shown along the  
edge which plugs into the module.  
The plastic key (and this bit is quite  
fiddly) must also be rotated so that it  
points out of the module so that the  
round pin aligns with the appropriate  
hole in the cover panel; (refer to the  
adjacent illustrations).  
1 2 0  
2 3 0  
1 0 0  
100  
120  
230  
240  
100V Setting  
(use for 90-105V) (use for 105-125V)  
120V Setting  
230V Setting  
(do not use)  
240V Setting  
(use for 220-240V)  
Note. Where the mains voltage is a nominal 230V, the ‘240V Setting’ should be used – not the ‘230V Setting’!  
• Re-insert the PCB and replace the fuse panel. The plastic pin should project through the appropriate  
hole.  
3.2 Mounting  
The XLogic unit is designed to be rack mounted. It is 2 RU (89mm/3.5 inches) high. Its depth is:  
325 mm/12.8 inches not including heatsink  
365 mm/14.3 inches including heatsink  
400 mm/15.75 inches including connectors  
The unit must be mounted on suitable rack shelves: do not rely on the rack mounting ears alone.  
A 1RU space should be left above each unit to ensure adequate ventilation.  
3.3 Connection  
The unit has six input XLRs (female) and six output XLRs (male). Connect the inputs to the main output  
insert sends of your console or to your workstation outputs. Connect the outputs to the corresponding  
insert returns or to your workstation inputs.  
When the unit is switched off the input XLRs are linked to the output XLRs by relays, so the unit will pass  
signal even when switched off. There is a 3 second delay after switching on before the bypass relays are  
energised to allow the power rails to settle, thus avoiding unpleasant thumps and pops on your  
monitoring.  
Note that when switched off the DC coupled input stage of the XLogic Multichannel Compressor can load  
the output stages of some devices, causing low level distortion. For this reason it is not advisable to leave  
the unit connected and switched off.  
Once the unit is connected switch it on, then route signal to each channel in turn and check that the correct  
signal LED lights yellow in the MAX display and that the signal is returned to the correct input on your  
console or workstation.  
Page 6  
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Installation and Operation  
4.0 Operation  
The XLogic Multichannel Compressor unit is a 2U rack-mounting six-channel compressor designed to provide  
extremely flexible control over a 5.1 channel mix, or to be used as two separate compressors when working on  
stereo material. The compressor design is very similar to that found in the XL 9000 console centre section, but  
with additional controls to provide the flexibility that modern 5.1 productions require. The signal path is  
balanced and DC coupled through out: this ensures extended bandwidth, low noise and low distortion.  
5.1 mixing presents a number of challenges to the engineer that are not present when working in stereo. This is  
essentially because the signal content can vary hugely between speakers - both in level and frequency content –  
unlike stereo material where the two channels are normally similar in both level and content. This presents a  
number of potential problems including:  
• The LFE channel will almost certainly require different attack and release times and different thresholds  
from the other channels.  
• Depending on the material you may or may not want some channels to be compressed.  
• Conversely you may want some channels to be compressed but not to contribute to the overall  
compression.  
You may want channels to have different thresholds.  
• With five speakers it is possible have signals panned so that they are the loudest signal in the room but  
not the loudest signal in any one speaker.  
The XLogic Multichannel Compressor is designed to give the engineer a flexible but easy to use set of tools to  
deal with all these potential problems – and hopefully those we haven’t thought of yet.  
4.1 Compressor Controls  
The compressor sidechain controls  
METER  
MAIN/STEREO A  
are straight forward and hopefully  
require little explanation. The  
ATTACK, RELEASE and RATIO  
controls are six position switches:  
the THRESHOLD and MAKEUP  
GAIN controls are continuously  
variable.  
THRESHOLD  
ATTACK - mS  
RATIO  
RELEASE - S  
.4  
.8  
MAKE-UP  
1
3
3
4
.3  
10  
2
.2  
1.6  
5
AUTO  
0
.1  
30 1.5  
10  
1
IN  
dB  
COMPRESSION  
-20  
+20  
LFE/STEREO B  
THRESHOLD  
ATTACK - mS  
RATIO  
RELEASE - S  
.4  
.8  
MAKE-UP  
1
3
3
4
.3  
10  
2
.2  
1.6  
5
AUTO  
0
.1  
30 1.5  
10  
1
IN  
LFE/  
ST B  
-20  
+20  
The compression meter at the left  
of the unit normally displays gain  
reduction for the Main (upper)  
compressor. Pressing the LFE/STB switch shows the gain reduction for the LFE (lower) compressor.  
4.2 Side Chain Adjust Section  
The side chain adjust section is the key to the operation of the XLogic Multichannel Compressor. It  
provides very flexible control of the compressor side chain.  
S-CHAIN TRIM controls – These allow the contribution of their  
respective channels to the side chain to be adjusted - effectively  
SIDE CHAIN ADJUST  
allowing different thresholds to be set for each input. They are  
C
LEFT/RIGHT  
CENTRE  
indented at the ‘2 o'clock’ position (which is marked ‘0’) to allow  
the trims to be easily set to the same level. When fully clockwise  
they increase the side chain level by 10dB – effectively reducing  
the threshold on that channel by 10dB. Turning a trim control  
fully anti-clockwise removes that input from the side chain  
completely.  
An example may help: imagine the mix you are working on has  
a number of loud sound effects in the surround channels. You  
want the surround channels to follow the same compression as  
0
0
L
R
ISO  
LFE  
MAX  
+10  
S-CHAIN TRIM  
+10  
S-CHAIN TRIM  
LS  
RS  
LFE  
SURROUND  
0
0
LFE  
LFE  
0DB  
LINK  
ISO  
+10  
+10  
S-CHAIN TRIM  
S-CHAIN TRIM  
the front channels, but don’t want the sound effects to compress the front channels. To achieve this simply  
turn the side chain trim control on the Surround channels anti-clockwise.  
Page 7  
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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 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  
MODE  
to provide separate compression of the surround channels or to allow the unit to be used as two  
SIDE  
CHAIN  
SUM  
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.  
DUAL  
STEREO  
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:  
FADER  
MASTER  
• The MASTER fader and its associated IN switch provide overall level control of the  
IN  
mix. When the IN switch is off the fader control has no effect.  
0dB  
• 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.  
RATE - Secs  
10  
30  
6
AUTO  
FADE  
3
40  
1
60  
Page 8  
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Appendix  
Appendix A – Internal links and fuses  
Fuses (Mains Inlet)  
The mains inlet contains a single 1 amp 1.25" time delay fuse (SSL Part No. 35FJJ310). To change it disconnect the  
mains inlet, then using a small screwdriver prise open the mains selector cover. This contains the fuse. Test and  
replace with the same type and value if necessary.  
Internal Fuses  
The internal power rails are also individually fused. These fuses should only be changed by suitably experienced  
staff. They are listed below  
Fuses (629610X1 Power Regulator Card)  
+48V FS-1 - 500mA wire ended (SSL part No. 35F5E250)  
Fuses (629601X1 Main Card)  
–18V FS1 - 3 amp wire ended (SSL part No. 35F5E330)  
–15V FS2 - 3 amp wire ended (SSL part No. 35F5E330)  
+15V FS3 - 3 amp wire ended (SSL part No. 35F5E330)  
+18V FS4 - 3 amp wire ended (SSL part No. 35F5E330)  
+5V FS5 - 3 amp wire ended (SSL part No. 35F5E330)  
Links  
LK3 Solder link. Links chassis and analogue 0V. Do not remove.  
LK4 Links 0V of input and output XLRs to chassis. Normally fitted. Remove to capacitively couple.  
LK5 Solder link. Links 0VA planes. Do not remove.  
LK6 Solder link. Links digital and analogue 0V. Do not remove.  
LK8 Not used  
LK9 Not used  
LK10 Normally audio passes through VCAs at all times. Removing LK10 will switch in the bypass  
relays when all compressor IN and Master Fader IN switches are off. Normally fitted.  
Appendix B – Connector Details  
Audio Output  
Audio Input  
Location:  
Rear Panel  
Location:  
Rear Panel  
Conn' Type: XLR Male  
Conn' Type: XLR Female  
Pin  
Description  
Pin  
Description  
1
Chassis  
1
Chassis  
2
Audio +ve  
Audio -ve  
2
Audio +ve  
Audio -ve  
3
3
Page 9  
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XLogic Multichannel Compressor Owner’s Manual  
Appendix C – Performance Specification  
Conditions  
Source impedance 50Ω unless otherwise stated.  
All measurements are RMS and are made using a 22Hz to 22kHz filter unless otherwise stated.  
Noise  
Input terminated with 50Ω. Compressor switched in and set for 0dB gain.  
Noise  
< 99dBu  
Headroom  
Headroom is defined at the output level at which THD exceeds 1%.  
Headroom  
> +26dBu output level, 20Hz to 20kHz at 0dB gain  
> 125dB  
Dynamic Range  
Frequency Response  
Measured reference level at 1kHz. Any gain setting. Source impedance 50Ω.  
20Hz to 20kHz  
10Hz to 96kHz  
10Hz to 200kHz  
0.05dB  
+0.2/-0.5dB  
+0.2/-2dB  
Common Mode Rejection Ratio (CMRR)  
Input level +20dBu, ground referenced.  
20Hz to 10kHz  
> 50dB  
THD + Noise  
Gain +0dB, input level +4dBu. Master Fader switched in. Compressor switched out.  
10Hz to 20kHz (80kHz filter) < 0.006%, typically 0.003%  
Gain +0dB, input level +20dBu. Master Fader switched in. Compressor switched out.  
10Hz to 20kHz (80kHz filter) < 0.01%, typically <0.006%  
THD with the compressor switched in is dependent on attack and release times and signal content.  
Crosstalk  
Channel to channel crosstalk, measured with one input terminated with 50Ω. All channels at 0dB gain.  
Apply +20dBu test tone to any channel input except the one under test. Crosstalk is the ratio of level at the  
output of the test channel and the output of the channel to which the signal is applied.  
Crosstalk @ 50Hz  
Crosstalk @ 1kHz  
< –105dB  
< –90dB  
Impedance  
Input Impedance  
> 10kΩ  
< 40Ω  
Output Impedance  
Page 10  
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Appendix  
Appendix D - Calibration Information  
The XLogic Multi Channel compressor is factory calibrated and should only need calibration if a potentiometer  
or other component has been replaced or if it is suspected that there is a problem with calibration.  
In all of the following instructions it is assumed that the lid has been removed and that power has been applied.  
It is also assumed that unless otherwise specified, all switches are released and all potentiometers are at unity,  
minimum or indent position as appropriate. The required accuracy for each adjustment will be specified along  
with the target value.  
All level and distortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise  
specified.  
DC Calibration  
Side Chain Trim Calibration  
Equipment Required:  
Unit Setup:  
Digital Volt Meter  
1. Ensure that all front panel switches are off and all controls are set fully anti-  
clockwise, except for the Side Chain Trim pots which should be set to indent.  
2. Reference the DVM to 0VA at TP42 on the lower card (629606).  
Adjustment:  
1. Measuring TP44 on the lower card (629606) – remove PL2 connector to access the  
test point – adjust VR8 (AutoFade offset) for 0mV 0.5mV. Reconnect PL2  
between the upper and lower cards.  
2. Set the Left/Right S-Chain Trim on the front panel to indent. Measuring TP3 on  
the upper card (629607), adjust VR6 on the upper card for –0.45V 10mV.  
3. Set the Centre S-Chain Trim on the front panel to indent. Measuring TP4 on the  
upper card (629607), adjust VR7 on the upper card for –0.45V 10mV.  
4. Set front panel pot, Surround S-Chain Trim, to indent. Measuring TP43 on the  
lower card (629606), adjust VR7 on the lower card for –0.45V 10mV.  
5. Set front panel pot, LFE S-Chain Trim, to indent. Measuring TP39 on the lower  
card (629606), adjust VR6 on the lower card for –0.45V 10mV.  
Side Chain Gain Adjustment  
Unit Setup:  
Switch the Master Fader IN. Measure TP5 on the upper card (629607) and adjust  
the Master Fader on the front panel for –2.00V 1mV (which equates to 40dB of  
attenuation).  
Adjustment:  
1. Measuring TP47 on the lower card (629606), adjust VR10 for +2.00V 1mV.  
2. Measuring TP45 on the lower card (629606), adjust VR9 for +2.00V 1mV.  
3. Release the Master Fader IN switch.  
Control Voltage Breakthrough Null  
Unit Setup:  
Select SIDE CHAIN SUM and press both compressor IN switches. Turn both  
front panel THRESHOLD pots fully anti-clockwise.  
Adjustment:  
1. Measuring TP4 on the lower card (629606), adjust VR11 for 0V 10mV. Turn the  
front panel Main/Stereo A Threshold pot fully clockwise – check that the  
measurement remains within 10mV of 0V and re-adjust if necessary.  
2. Turn the front panel Main/Stereo A Threshold pot fully anti-clockwise.  
Measuring TP6 on the lower card (629606), adjust VR12 for 0V 10mV.  
3. Turn the front panel LFE/Stereo B Threshold pot fully clockwise – check that the  
measurement remains within 10mV of 0V and re-adjust if necessary.  
4. Turn the front panel LFE/Stereo B Threshold pot fully anti-clockwise. De-select  
the compressor IN switches and the SIDE CHAIN SUM switch.  
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XLogic Multichannel Compressor Owner’s Manual  
Distortion Null  
Equipment Required:  
Calibrated audio oscillator, audio distortion analyser and oscilloscope  
Test Signal:  
1kHz sinewave at +24dBu  
Input and Output:  
Oscillator to the Input of the channel being tested, Output to the distortion  
analyser. Use the oscilloscope to monitor the measured signal.  
Adjustment:  
1. Connect the +ve input of the analyser to the test point as shown below and  
connect the –ve input of the analyser to a 0VA test point. Note that the circuitry  
at this point is balanced and so there are two measurements and two adjustments  
per channel. Adjust for minimum THD (< 0.007%).  
Input  
Measure  
TP31  
TP32  
TP29  
TP30  
TP27  
TP28  
TP21  
TP22  
TP23  
TP24  
TP25  
TP26  
Adjust  
VR24  
VR23  
VR22  
VR21  
VR20  
VR19  
VR14  
VR13  
VR16  
VR15  
VR18  
VR17  
Left (+ve)  
Left (–ve)  
Right (+ve)  
Right (–ve)  
Centre (+ve)  
Centre (–ve)  
LFE (+ve)  
LFE (–ve)  
Left Sur (+ve)  
Left Surr (–ve)  
Right Surr (+ve)  
Right Surr (–ve)  
2. Finally, re-connect the analyser to each output in turn and adjust the +ve  
distortion null to see if any reduction in THD can be achieved.  
VCA Gain Adjust  
Equipment Required:  
Calibrated audio oscillator, audio level meter, oscilloscope and a (digital) DC  
voltmeter  
Test Signal:  
1kHz sinewave at +20dBu  
Input and Output:  
Oscillator to the Input of the channel being tested, Output to the level meter. Use  
the oscilloscope to monitor the measured signal.  
Unit Setup:  
Adjustment:  
1. Switch the Master Fader IN.  
2. Using the DVM, measure TP5 on the upper card (629607) and adjust the front  
panel Master Fader for –2.00V 1mV (which equates to 40dB attenuation).  
1. Connect the audio level meter to each output in turn. Measure each channel,  
adjusting the appropriate preset for –20dBu 0.1dB (which equates to 40dB of  
attenuation).  
Input  
Adjust  
VR30  
VR29  
VR34  
VR36  
VR27  
VR28  
Left  
Right  
Centre  
LFE  
Left Surround  
Right Surround  
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Appendix  
Appendix E – Physical specification *  
Depth:  
325mm/12.8 inches not including heatsink  
365mm/14.3 inches including heatsink  
400mm/15.75 inches including connectors  
Height:  
89mm/3.5 inches (2 RU)  
480mm/19 inches  
Width:  
Weight:  
5kg/11 pounds  
Power:  
55 Watts/67 VA  
Boxed size:  
Boxed weight:  
520mm x 520mm x 182mm (20.5" x 20.5" x 7.2")  
7.3kg (16 pounds)  
* All weights and dimensions are approximate  
Appendix F – Environmental Specification  
Temperature  
Operating:  
5 to 30 Deg. C  
Non-operating:  
Max. Gradient:  
–20 to 50 Deg. C  
15 Deg. C/Hour  
Relative Humidity  
Operating:  
20 to 80 %  
Non-operating:  
Max. wet bulb:  
5 to 90 %  
29 Deg. C (non-condensing)  
Vibration  
Shock  
Operating:  
Non-operating, power off:  
< 0.2 G (3 - 100Hz.)  
< 0.4 G (3 - 100Hz.)  
Operating:  
Non-operating:  
< 2 G (10mSec. Max.)  
< 10 G (10mSec. Max.)  
Altitude  
Operating:  
Non-operating:  
0 to 3000m (above sea level)  
0 to 12000m  
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XLogic Multichannel Compressor Owner’s Manual  
Notes  
Page 14  
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