G Series Bus Compressor Module
for 500 Series Racks
User Guide
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Safety and Installation Considerations
This page contains denitions, warnings, and practical information to ensure a safe
working environment. Please take time to read this page before installing or using this
apparatus.
General Safety
• Read these instrucons.
• Keep these instrucons.
• Heed all warnings.
• Follow all instrucons.
• Do not use this apparatus near water.
• Do not expose this apparatus to rain or moisture.
• Clean only with dry cloth.
• Do not block any venlaon openings.
• Install in accordance with the rack manufacturer’s instrucons.
• There are no user-adjustments, or user-servicable items, on this apparatus.
• Adjustments or alteraons to this apparatus may aect the performance such
that safety and/or internaonal compliance standards may no longer be met.
• This apparatus is not to be used in safety crical applicaons
Caution
• This apparatus should not be used outside of the scope of API 500 series compable
racks.
• Do not operate this apparatus with any covers removed.
• To reduce the risk of electric shock, do not perform any servicing other than that
contained in these Installaon Instrucons unless you are qualied to do so. Refer all
servicing to qualied service personnel.
Installation
• Ensure power is removed from the rack before ng or removing this apparatus to
or from the rack.
• Use the panel xing screws supplied with the rack to secure this apparatus into the
rack.
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Standards Compliance
This apparatus is designed to be installed and used in API
500 series compatible racks which are CE marked. The CE
mark on a rack is indicative that the manufacturer conrms
that it meets both EMC and the Low Voltage Directive
(2006/95/EC).
Instructions for Disposal of WEEE by Users in the
European Union
The symbol shown here is on the product or on its
packaging, which indicates that this product must not
be disposed of with other waste. Instead, it is the user’s
responsibility to dispose of their waste equipment by
handing it over to a designated collection point for
recycling of waste electrical and electronic equipment. The separate
collection and recycling of your waste equipment at the time of
disposal will help to conserve natural resources and ensure that
it is recycled in a manner that protects human health and the
environment. For more information about where you can drop
off your waste equipment for recycling, please contact your local
city ofce, your household waste disposal service or where you
purchased the product.
Limited Warranty
Please refer any warranty claim to the supplier of this equipment in
the rst instance. Full warranty information for equipment supplied
directly by Solid State Logic can be found on our website:
www.solidstatelogic.com
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Introduction
Congratulations on your purchase of this API 500 format compatible
SSL G Series Bus Compressor module.
This module has been specically designed to operate in a 500
format rack such as the API lunchbox® or equivalent. In common
with many such modules, the nominal input/output level is +4dBu.
The module is a stereo compressor, designed to provide exible
control over a stereo mix. The compressor design is based around
the Bus Compressor found in the SL 4000 G Series console.
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Operation
Please refer to the front panel illustration
The main VCA is permanently in circuit; the compressor sidechain
is enabled by the IN switch. The other sidechain controls are
equally straight forward and hopefully require little explanation.
The ATTACK, RATIO and RELEASE controls are multi-position
switches; the THRESHOLD and MAKE-UP controls are
continuously variable potentiometers.
It should be noted that the knee point of the compressor, set with
the THRESHOLD control, purposely changes depending on the
setting of the RATIO control. Decreasing the RATIO setting lowers
the effective threshold, hence maintaining the perceived ‘loudness’
of the compressed signal.
The compressor features a classic ‘dominant’ sidechain
architecture. The left and right channels are independently rectied
using a true peak full wave detector circuit, and the dominant, ie.
louder channel, controls the gain reduction of the overall stereo
level via the user selected time constants. The compressor now
features an HPF (High Pass Filter) in the sidechain, which is
controlled by a multi-position switch.
The illuminated compression meter at the top of the module
displays gain reduction for the compressor.
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Visit SSL at:
www.solidstatelogic.com
© Solid State Logic
All rights reserved under International and Pan-American Copyright Conventions
SSL® and Solid State Logic® are ® registered trademarks of Solid State Logic.
ORIGIN™, SuperAnalogue™, VHD™ and PureDrive™ are trademarks of Solid State Logic.
All other product names and trademarks are the property of their respective owners and are
hereby acknowledged.
No part of this publication may be reproduced in any form or by any means, whether me-
chanical or electronic, without the written permission of Solid State Logic, Oxford, OX5 1RU,
England.
As research and development is a continual process, Solid State Logic reserves the right to
change the features and specications described herein without notice or obligation.
Solid State Logic cannot be held responsible for any loss or damage arising directly or
indirectly from any error or omission in this manual.
PLEASE READ ALL INSTRUCTIONS, PAY SPECIAL HEED TO SAFETY WARNINGS.
E&OE
July 2020
Revision History
Revision V2.0, June 2020 - Revised Layout Release for Module Update
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