DL441 QUAD COMPRESSOR LIMITER OPERATORS MANUAL CONTENTS SAFETY CONSIDERATIONS page 1 INTRODUCTION page 2 INSTALLATION page 3 CONTROL DESCRIPTIONS C Compressor C Peak Limit C Stereo Link page page page page OPERATION page 7 IF A FAULT DEVELOPS page 8 CONTACTING DRAWMER page 8 TECHNICAL SPECIFICATION page 9 BLOCK DIAGRAM page 10 i 5 5 6 6
COPYRIGHT This manual is copyrighted © 1997 by Drawmer Electronics, Ltd. With all rights reserved. Under copyright laws, this manual may not be duplicated in whole or in part without the written consent of Drawmer. ONE YEAR LIMITED WARRANTY Drawmer Electronics Ltd., warrants the Drawmer DL441 audio processor to conform substantially to the specifications of this manual for a period of one year from the original date of purchase when used in accordance with the specifications detailed in this manual.
DL441 OPERATORS’ MANUAL 1 DRAWMER DL441 Quad Compressor Limiter SAFETY CONSIDERATIONS CAUTION - MAINS FUSE TO REDUCE THE RISK OF FIRE REPLACE THE MAINS FUSE ONLY WITH THE SAME TYPE, WHICH MUST BE A CLASS 3, 230 VOLT, TIME DELAY TYPE, RATED AT 63mA WHERE THE MAINS INPUT VOLTAGE SWITCH IS SET TO 230 VOLTS AC. AND 125mA WHERE THE MAINS INPUT VOLTAGE IS 115 VOLTS AC. ALL FUSES MUST COMPLY WITH IEC 127-2. THE FUSE BODY SIZE IS 20mm x 5mm.
2 DL441 OPERATORS’ MANUAL INTRODUCTION The DL441 is a quad channel compressor / limiter designed to meet the needs of professional studio and live sound applications. It may be used in balanced or unbalanced systems and each channel is independently switchable between +4dBu and -10dBv operating levels by means of a rear panel button. In addition to the compressor / limiter, each channel also contains an independent, fast-acting peak limiter.
DL441 OPERATORS’ MANUAL 3 INSTALLATION The DL441 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 and 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.
4 DL441 OPERATORS’ MANUAL 1: Disconnect the unit from the mains. 2: Using a number 1 size pozidrive screwdriver, remove the two self-tapping screws holding the voltage selection switch cover plate on the rear panel. 3: Remove the cover plate and slide the switch fully to its opposite end. 4: Rotate the cover plate one half turn, (180E) and refit the two screws. 5: Replace with a correctly rated fuse for the selected operation voltage. 6: Re-connect to mains power source.
DL441 OPERATORS’ MANUAL 5 CONTROL DESCRIPTION All four channels of the DL441 are identical and may be used completely independently or linked for stereo operation. Separate linking switches are provided to link channels 1 and 2 or channels 3 and 4. In the linked mode, only the left hand channel controls are functional and serve as master controls, though the channel bypass switches remain independent.
6 DL441 OPERATORS’ MANUAL Bypass: This switch will disable the functioning of the Compressor section and the Peak Limiter. If operating in Stereo Linked mode, both linked channels will be bypassed simultaneously. The DL441 Bypass is a 'hard bypass' which directly links the input sockets to the output sockets whenever Bypass is active. The adjacent red LED indicates the Bypass status.
DL441 OPERATORS’ MANUAL 7 OPERATION The unit should be connected in-line with the signal to be processed via suitable insert points. Ensure that the insert send and return level on your console matches the operating level set up using the rear panel push-buttons on the DL441. If not, select the appropriate operating level on the DL441. For mono use, each channel may be considered as being completely independent and set up accordingly.
8 DL441 OPERATORS’ MANUAL IF A FAULT DEVELOPS For warranty service please call Drawmer Electronics Ltd. Or their nearest authorised service facility, giving full details of the difficulty. On receipt of this information, service or shipping instructions will be forwarded to you. No equipment should be returned under the warranty without prior consent from Drawmer or their authorised representative. For service claims under the warranty agreement a service Returns Authorisation (RA) number will be given.
DL441 OPERATORS’ MANUAL 9 TECHNICAL SPECIFICATIONS INPUT IMPEDANCE 20KOhm MAXIMUM INPUT LEVEL +21dBu (+17dB ref.
10 BLOCK DIAGRAM DL441 OPERATORS’ MANUAL
