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DRAWMER

THREE-SUM

Multi-Band Interface

OPERATOR’S MANUAL

CONTENTS

Warranty

Safety Consideration

Chapter 1 - Introduction

Introduction

Installation

Audio Connections

Power Connection

Chapter 2 - Control Description

Control Description

Chapter 3 - Operation

Operation

Chapter 4 - General Information

If a fault develops

Contacting Drawmer

Specification

Block Diagram

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Summary of content (11 pages)

PAGE 1
DRAWMER THREE-SUM Multi-Band Interface OPERATOR’S MANUAL CONTENTS Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Safety Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Chapter 1 - Introduction Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Installation . . . . . . . . . . . . . . . . .
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COPYRIGHT This manual is copyrighted © 2005 by Drawmer Electronics Ltd. With all rights reserved. Under copyright laws, no part of this publication may be reproduced, transmitted, stored in a retrieval system or translated into any language in any form by any means, mechanical, optical, electronic, recording, or otherwise, without the written permission of Drawmer Electronics Ltd. ONE YEAR LIMITED WARRANTY Drawmer Electronics Ltd.
PAGE 3
CHAPTER 1 DRAWMER THREE-SUM MULTI-BAND INTERFACE INTRODUCTION The benefits of multi-band processing, with the ability to apply different parameters to different sections of the audio bandwidth have been apparent to sound engineers for quite some time. However, ‘locking in’your audio to any one specific multiband unit can vastly reduce the creative options.
PAGE 4
INSTALLATION The THREE-SUM is designed for standard 19" rack mounting and occupies 1U of rack space. Avoid mounting the unit directly above power amplifiers or power supplies that radiate significant amounts of heat. Always connect the mains earth to the unit. Fibre or plastic washers may be used to prevent the front panel becoming marked by the mounting bolts.
PAGE 5
fig.2 THREE-SUM REAR CONNECTOR WIRING POWER CONNECTION The Three-Sum unit will be supplied with a power cable suitable for domestic power outlets in your country. For your own safety, it is important that you use this cable to connect to the mains supply earth. The cable must not be tampered with or modified. The power supply socket has an integral fuse drawer containing the power fuse of the same value, to suit the mains voltage for which the unit has been supplied.
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CHAPTER 2 CONTROL DESCRIPTION Input Level Trim: -10dB - +10dB Typically, the Input Trim level control is used to match the output of the preceding device to the input needs of the three compressors that the signal will pass through. Alter the “Meter Input/Output Switch” to "input" to see the effect of the input trim on the signal level to the three compressors. On an optimal signal the 0dB provides optimum headroom and signal-to-noise ratio.
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Limiter The signal culminates in a variable threshold, brick wall limiter. The limiter can be bypassed completely using this switch in the OUT position. When in bypass the unit will sum the three bands back to a full band stereo signal but then no further processing is applied (the VCA is also bypassed). This is ideal for the purists who would prefer to keep the signal path as simple as possible, but it does mean the signal level will have to managed by themselves elsewhere.
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CHAPTER 3 OPERATION Most conventional compressors work by processing the full-band of the music, where the whole of the signal is compressed using the same controls, however, this is by no means perfect. A problem occurs whereby when a peak occurs, such as the beat of a kick drum, all of the signal is effectively "turned down" by the compressor, including the vocals, guitar, hi-hats etc. even though these may not need compressing.
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setting a crossover point in the middle of the vocal range can completely mess up the vocal sound. In general it's best to set the low crossover point below the vocal frequency range (about 150Hz to 250Hz) and set the high crossover point between 5kHz and 8kHz (but no lower 3kHz) to catch the brightness of an acoustic guitar or cymbals etc, and embellish the feeling of detail and air, creating an effect similar to that of using an enhancer. Using Multi-Band Compression on Single Instruments.
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CHAPTER 4 GENERAL INFORMATION It is the responsibility of the installer to ensure that the continuous power rating of the speakers is not exceeded, as Drawmer Electronics Ltd will not accept any responsibitlity for speaker damage caused by incorrect settings. IF A FAULT DEVELOPS CONTACTING DRAWMER For warranty service please call Drawmer Electronics Ltd. or their nearest authorised service facility, giving full details of the difficulty. Drawmer Electronics Ltd.
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BLOCK DIAGRAM Three-Sum ver 01 B 15/06/06 DRAWMER THREE-SUM OPERATOR’S MANUAL 11