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Drawmer DL231 Operator's Manual

Dual expander compressor limiter
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Table of Contents

DL231
OPERATORS MANUAL
h
DRAWMER ELECTRONICS LTD. 1990
CONTENTS
page 1
page 2
page 3
page 4
page 6
page 8

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Summary of Contents for Drawmer DL231

  • Page 1: Table Of Contents

    DL231 OPERATORS MANUAL CONTENTS SAFETY CONSIDERATIONS page 1 INTRODUCTION page 2 INSTALLATION page 3 CONTROL DESCRIPTIONS page 4 OPERATION page 6 TECHNICAL SPECIFICATION page 8 DRAWMER ELECTRONICS LTD. 1990...
  • Page 2 In the case of a valid warranty claim, your sole and exclusive remedy and Drawmer’s entire liability under any theory of liability will be to, at Drawmer’s discretion, repair or replace the product without charge, or, if not possible, to refund the purchase price to you.

  • Page 3: Safety Considerations

    DL231 OPERATORS MANUAL DRAWMER DL231 Dual Expander 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.

  • Page 4: Introduction

    The DL231 is a dual channel Expander/ Compressor/Limiter combining ease of operation with flexible performance. Each channel consists of a compressor, having variable threshold, ratio, attack, release, and output gain controls;...

  • Page 5: Installation

    DL231 OPERATORS MANUAL INSTALLATION The DL231 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. Fibre or plastic washers may be used to prevent the front panel becoming marked by the mounting bolts.

  • Page 6: Control Descriptions

    DL231 OPERATORS MANUAL CONTROL DESCRIPTION Both channels of the DL231 are identical and may be used completely independently or linked for stereo operation. In the linked mode, only the left hand channel controls are functional and serve as master controls, though the channel bypass switches remain independent.
  • Page 7 DL231 OPERATORS MANUAL LED BAR DISPLAY is a dual function facility which measures output level (input level if bypass is selected) or gain-reduction, selectable by the display switch. The VU meter and threshold controls are calibrated to show 0VU at +4dB In the gain reduction mode, all the red LED’s are very slightly illuminated at all...

  • Page 8: Operation

    DL231 OPERATORS MANUAL OPERATION Having connected signal inputs and outputs as required, set the unit as follows- Threshold, Ratio, Attack, Release Anti clockwise Output Gain 0 dB Display Switch Output Switch Bypass Peak Limit Stereo Link Display Expander Adjust input signal level on preceding equipment to show 0 dB on display, peaking to +2.
  • Page 9 DL231 OPERATORS MANUAL Using the Expander alone Disable the compressor by turning either the threshold or ratio anti-clockwise. Adjust the expander as described above but use compressor release control to adjust release time. An in-built ‘hold’ facility stabilises the expander against momentary gain reduction during short duration decreases in the signal level.

  • Page 10: Technical Specification

    DL231 OPERATORS MANUAL TECHNICAL SPECIFICATIONS (Measurements taken at +4dBu operating level where applicable) INPUT IMPEDANCE 20KOhm BANDWIDTH 20Hz - 22KHz (1dB) MAXIMUM OUTPUT LEVEL +24dBm (Electronic - floating) +22dBm (Unbalanced) SIDE CHAIN Send/Return Unbal, in phase input pin 2. NOISE @ UNITY GAIN (Referred to +4dBm) Expander off.

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