Gem Audio Labs Preceptor User Manual
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Gem Audio Labs Preceptor User Manual

Analog compressor / limiter model-a
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______________________________________________________________________________________________________________________________
User's Manual
Preceptor
analog compressor / limiter
model-A
Gem Audio Labs
Tel. : 00 48 508 377 982
office@gemaudiolabs.com
www.gemaudiolabs.com
Rev.3
Date 03.07.2012
Page 1 / 17

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Summary of Contents for Gem Audio Labs Preceptor

  • Page 1 ______________________________________________________________________________________________________________________________ User’s Manual Preceptor analog compressor / limiter model-A Gem Audio Labs Tel. : 00 48 508 377 982 office@gemaudiolabs.com www.gemaudiolabs.com Rev.3 Date 03.07.2012 Page 1 / 17...
  • Page 2 ____________________________________________________________________________________________________________________________ CE Conformity We declare with sole responsibility that this product complies with the following norms and directives:  2006/95/EC LVD (Low Voltage Directive)  2004/108/EC EMC (Electromagnetic Compatibility)  DIN EN 55103-1 EMC of audio equipment- Emission  DIN EN 55103-2 EMC of audio equipment- Immunity This declaration becomes invalid by any unapproved modification of the device.

  • Page 3: Table Of Contents

    ____________________________________________________________________________________________________________________________ TABLE OF CONTENTS INTRODUCTION ..........................4 FOR SAFE OPERATION ........................4 CAUTION .............................. 5 FOR CORRECT OPERATION ......................6 DESIGN ..............................6 THE FRONT PANEL CONTROLS AND THEIR USE ..............9 THE REAR PANEL ..........................13 BLOCK DIAGRAM ..........................14 TECHNICAL DATA ...........................

  • Page 4: Introduction

    ____________________________________________________________________________________________________________________________ INTRODUCTION First of all, we would like to thank You sincerely for choosing this GEM AUDIO LABS Preceptor which combines ease of operation with support for multiple usage environments. As a company and first of all, as fans of pro audio devices, we do our best in our daily work to satisfy your most sophisticated sound expectations.

  • Page 5: Caution

    ____________________________________________________________________________________________________________________________ OPERATION  Do not scratch, bend, twist, pull, or heat the power cord. A damaged power cord is a fire and electrical shock hazard.  Do not remove the unit‟s cover. You could receive an electrical shock. If you think internal inspection, maintenance, or repair is necessary, contact your dealer or producer.

  • Page 6: For Correct Operation

    DESIGN The GEM AUDIO LABS Preceptor is a two channel (stereo/dual mono) pure analog (Class-A, discrete) dynamic processor, in which the gain reduction is made by a discrete VCA based on bipolar transistors and Zener diodes. In fact, there are two independent mono blocks sharing common enclosure, ON/OFF switch and LINK/DUAL MONO switch.
  • Page 7 ____________________________________________________________________________________________________________________________ POWER SUPPLY SECTION Special care has gone into the design of the power supply of the Preceptor because the power supply is the heart of any electronic system, and the better it is, the better the whole system works. In an audio system, this translates into a better sound quality, lower noise and unwanted distortion elimination.
  • Page 8 ____________________________________________________________________________________________________________________________ ROTARY AND TOGGLE SWITCHES Preceptor has only rotary and toggle switches installed to obtain the best repeatability of all settings. Thus you can easily return to your favorite settings. By using 1% low-noise metalized resistors and gold contact rotary switches, we succeeded to obtain (in the link mode) the difference between levels and characteristics of two channels in a range of +/- 0.1 dB.

  • Page 9: The Front Panel Controls And Their Use

    (HIGH- 2k5Ω, LOW- 10KΩ) SIDECHAIN In the INT mode the Preceptor acts as a normal compressor sending main INPUT signal to the gain reduction stage. In the EXT position You can use another audio track (sending it to the EXT SIDECHAIN input on the rear panel) to control the volume of the main INPUT signal.
  • Page 10 There is another trick in the box. If the SIDECHAIN switch is in the EXT position and the EXT SIDECHAIN input does not receive any signal, then the Preceptor turns into a pleasant harmonic distortion generator. The amount of distortion depends on the Z and the INPUT switches settings.
  • Page 11 ____________________________________________________________________________________________________________________________ LIMIT/COMP In the COMP position the Preceptor operates as a compressor with 2:1 compression ratio. In the limit mode its behavior can be compared to the famous Fairchild 660 limiter. SPEED This switch allows to choose between three attack and release speed modes: “F”- fast mode,...
  • Page 12 OFF position. LINK/DUAL MONO When set to the up (LINK) position, the two channels of the Preceptor act as a single stereo compressor, with equal gain reduction on both sides, even when there is transient activity only on one channel. You only need to set all the functions on the left and right channel in the same position.

  • Page 13: The Rear Panel

    The mains AC connector is a standard IEC-type 3 pin connector with a AC fuses (2 pieces) holder. The ground of this AC connector is permanently internally connected to the chassis of the Preceptor for safety. It is important to change the fuse before changing the supply voltage:  630mA (slo-blo; 5x20mm) for 230V~50 Hz ...

  • Page 14: Block Diagram

    ____________________________________________________________________________________________________________________________ BLOCK DIAGRAM Rev.3 Date 03.07.2012 Page 14 / 17...

  • Page 15: Technical Data

    ______________________________________________________________________________________________________________________________ TECHNICAL DATA  Inputs: Balanced XLR  Outputs: Balanced XLR  Ext. sidechain inputs: Balanced TRS  Signal transformers: Carnhill  Bypass: hard relay bypass  Input impedance: 2k5Ω or 10kΩ switched on the front panel  Output impedance: < 50Ω ...

  • Page 16: Environmental Protection

    ______________________________________________________________________________________________________________________________ ENVIRONMENTAL PROTECTION At the end of its operating life, this product must not be disposed of with regular household waste but must be returned to a collection point for the recycling of electrical and electronic equipment. The wheelie bin symbol on the product and user„s manual indicates that. The materials can be re-used in accordance with their markings.

  • Page 17: Limited Warranty

    Warranty will not apply because of incorrect storage, dropping, excessive shocks, corrosions, dirt, water or sand damages.  To confirm your warranty please register your Gem Audio Labs product shortly after purchase. Please fill out your user registration card (included in the original packaging) and send it via e-mail to office@gemaudiolabs.com or via mail to: SPLASH BARTOSZ RADZISZEWSKI, Wietrzna 36/1, 53-024 Poland.

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