Drawmer DL221 Operator's Manual
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Drawmer DL221 Operator's Manual

Dual compressor limiter
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DL221
OPERATORS MANUAL
h
DRAWMER ELECTRONICS LTD. 1990
and DL120
CONTENTS
page 1
page 2
page 3
page 4
page 6
page 8

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Summary of Contents for Drawmer DL221

  • Page 1: Table Of Contents

    DL221 OPERATORS MANUAL and DL120 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

    DL221 OPERATORS MANUAL DRAWMER DL221 Dual 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 DL120 is a Modular, Single Compressor/Limiter offering identical performance. Each section (Two in the DL221, one in the DL120) consists of a compressor, having variable threshold, ratio, attack, release, and output gain, plus a separate peak limiter, which is particularly useful in preventing momentary overload when using gentle compression slopes and/ or slow attack times.

  • Page 5: Installation

    DL221 OPERATORS MANUAL INSTALLATION The DL221 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

    DL221 OPERATORS MANUAL CONTROL DESCRIPTION Both channels of the DL221 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 DL221 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

    DL221 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 Adjust input signal level on preceding equipment to show 0 dB on display, peaking to +2.
  • Page 9 If side-chain access is not required, pins 22 and 23 must be shorted, either at the rack or patch bay. On the DL221, side-chain access is via a stereo jack socket at the rear (RING--SEND TIP-- RETURN). Send and return are automatically shorted when no plug is inserted...

  • Page 10: Technical Specification

    DL221 OPERATORS MANUAL TECHNICAL SPECIFICATIONS (Measurements taken at +4dBu operating level where applicable) INPUT IMPEDANCE 10KOhm HEADROOM +18dB BANDWIDTH 20Hz - 30KHz (1dB) NOISE @ UNITY GAIN (Referred to +4dBm) Wideband !85dB 22Hz-22KHz !90dB CCIR ARM !91dB IEC A !93dB...

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Dl120

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