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Table of Contents

421m

Chapter 1

Introduction

1

Chapter 2

Operator Safety Summary

2

Chapter 3

Front & Rear Panel Overview

3

Chapter 4

Installation

6

Chapter 5

Operation

8

Chapter 6

Applications

10

Chapter 7

Specifications

13

Chapter 8

Troubleshooting

14

Chapter 9

Warranty and Service

15

Appendix A

Declaration of Conformity

17

©

 April 2000-01 Symetrix, Inc. All rights reserved.

Symetrix Part Number 53421M0C00

The information in this guide is subject to change without
notice.  Symetrix,  Inc.  shall  not  be  liable  for  technical  or
editorial errors or omissions contained herein; nor is it liable
for incidental or consequential damages resulting from the
furnishing, performance, or use of this material.

Mention  of  third-party  products  is  for  informational  pur-
poses  only  and  constitutes  neither  an  endorsement  nor  a
recommendation. Symetrix assumes no responsibility with
regard to the performance or use of these products.

Under  copyright  laws,  no  part  of  this  user  guide  may  be
reproduced  or  transmitted  in  any  form  or  by  any  means,
electronic  or  mechanical,  without  permission  in  writing
from Symetrix, Inc. If, however, your only means of access
is electronic, permission to print one copy is hereby granted.

6408 216th St. SW

Mountlake Terrace

, WA  980

43

  USA

Tel (425) 7

78-7728

Fax (425) 7

78-7727

Email  [email protected]

Содержание 421m

Страница 1: ...421m 421m AGC Leveler Users Guide ...

Страница 2: ...contained herein nor is it liable for incidental or consequential damages resulting from the furnishing performance or use of this material Mention of third party products is for informational pur poses only and constitutes neither an endorsement nor a recommendation Symetrix assumes no responsibility with regard to the performance or use of these products Under copyright laws no part of this user...

Страница 3: ...been evaluated by UL and meet the applicable UL Standards for Safety We recommend that you read this manual from cover to cover Somewhere between the confines of the two covers you should find the answers to most of your questions If not please feel free to contact our Customer Service department via phone fax or e mail for answers to your questions The numbers are Telephone 425 778 7728 Fax 425 7...

Страница 4: ...s been dropped AVIS NE PAS OUVRIR Il ne se trouve a l interieur aucune piece pourvant entre reparée l usager SEE OWNERS MANUAL VOIR CAHIER D INSTRUCTIONS S adresser a un reparateur compétent RISQUE DE CHOC ELECTRIQUE No user serviceable parts inside Refer servicing to qualified service personnel CAUTION WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MO...

Страница 5: ... level required to make the AGC Leveler try to maintain the Target Output Level Once the signal falls below the AUTO RELEASE setting the AGC Leveler allows the signal to decrease When the input signal exceeds the AUTO RELEASE setting the AGC Leveler once again tries to maintain constant output level RECOVERY RATE Sets the basic recovery time Fast for speech slow for music or music speech Fast migh...

Страница 6: ...Thiscontrolhard wirebypassesthe421m IfSTEREOLINKED alllinked slave units revert to bypass when the bypass button on the master unit is out On any individual slave unit that has been STEREO LINKED STEREO LINK button OUT this button has no effect INPUT LED This meter indicates the input signal level to the 421m It is a VU calibrated peak readingmeter OUTPUT LED This meter indicates the output signal...

Страница 7: ...evel lowimpedanceoutputs XLR pin 1 is ground pin 2 is high and pin 3 is low The 1 4 connector tip is high ring is low and sleeve is ground The screw terminal output is wired in parallel to the ø and XLR connectors Rear panel view right LINE INPUT These connectors are electronically balanced line level bridging inputs The 1 4 connector tip is high ring is low and sleeve is ground The screw terminal...

Страница 8: ...fthegroundingplug Mounting In An Equipment Rack The 421m occupies one rack space 1U in a standard equipment rack with a width of 19 48 3cm a depth of 6 5 16 8cm and a height of 1 75 4 45cm Allow at least 4 10 16cm behind the unit for the protrusion of connectors We recommend you take care not to mount the 421m next to devices that emit large electromagnetic fields such as audio power amplifiers To...

Страница 9: ...21m s If you connect either connector to a MIDI device it probably won t harm anything but it definitely won t work Decide which unit is the master and which unit is the slave using force only if absolutely neces sary and set the front panel MASTER SLAVE switches accordingly In stereo mode the slave unit s controls are disabled and only the master unit controls affect operation The following diagr...

Страница 10: ...GC Leveler interprets the fade as a decrease in signal level and raises the gain to try to maintain the level set by the TARGET OUTPUT LEVEL control In effect the AGC Leveler un does the fade which may or may not be allowable The AUTO RELEASE LEVEL control sets how far the signal level can fall before the AGC Leveler stops trying to raise the gain More CCW set tings lower this level which may be w...

Страница 11: ...al level needed to cause gain re lease in the AGC Leveler A suggested method of setting it is with no signal present increase the setting of the ARL control until the green ACTIVE LED extinguishes Then further increase the control setting slightly For musical signals use the SLOW setting of the RECOVERY RATE button Set the AUTO RE LEASE LEVEL control so that the ACTIVE LED is extinguished during l...

Страница 12: ...ble levels Most CD s simply have too much range for foreground or background music applications The 421m helps reduce the overall dynamic range while retaining some semblance of the music s original dynamics You can link two units together for stereo if desired There s probably no need to use the downward expander in this application so turn the THRESH OLD control to the BYPASS position Set the AG...

Страница 13: ...ve PA Have you ever mixed live sound for someone who just can t play at the right level They re usually too soft when playing rhythm and too loud when playing leads A 421m can help you out Connect the 421m into the mixer s channel insert jack use a relatively low RATIO setting use the expander if you need to Remember that lower ratio settings allow for more dynamics than the higher settings which ...

Страница 14: ...d in the audience area of a theatre or auditorium that feeds an amplifier that drives speakers located in the backstage areas of the hall The potential dynamic range in this application is tremendous ranging from an empty room to an audience on their feet making a plea for an encore A 421m in conjunction with close miking of the person calling the cues can work wonders keeping this sort of system ...

Страница 15: ...ging from 54 VU to 12 VU 50 dBu to 16 dBu An output clipping indicator shall be provided The AGC shall provide facilities for stereo coupling two units via a shielded 5 pin DIN male to male cable A front panel switch shall designate which unit is the master and which unit is the slave The line level inputs shall be active balanced bridging designs terminated with 1 4 TRS female and screw terminals...

Страница 16: ... with sine waves Use speech or music Distortion Is the incoming signal already distorted Listen up stream from the 421m or manually place the unit in BYPASS mode to determine that you are feeding it a clean signal Buzzintheoutput Check input and output connector wiring Check for ground loops between interconnected system equipment Are all system components on the same AC ground Noise hiss Check in...

Страница 17: ...ducts will be returned freight collect THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED ARISING BY LAW OR OTHERWISE INCLUDING WITHOUT LIMITATION ANY OBLIGATIONS OF THE SELLER WITH RESPECT TO CONSEQUENTIAL DAMAGES INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR USE AND OF ALL OTHER OBLIGATIONS OR LIABILITIES ON OUR PART AND WE NEITHER ASSUME NOR AUTHORIZE AN...

Страница 18: ... in warranty will cost you only one way freight charges We ll prepay the return surface freight If you send us your product in substandard packaging we will charge you for factory ship ping materials If you don t have the factory packaging materials please use an oversized carton wrap the unit in a plastic bag and surround it with bubble wrap Pack the box full of Styrofoam peanuts Be sure there is...

Страница 19: ... related apparatus for household and similar general use EN 50082 1 Electromagnetic compatibility Generic immunity standard Part 1 Residential commercial and light industry The technical construction file is maintained at Symetrix Inc 6408 216th St SW Mountlake Terrace WA 98043 USA The authorized representative located within the European Community is World Marketing Associates P O Box 100 St Aust...

Страница 20: ...421m ...

Страница 21: ...421m ...

Страница 22: ...421m 22 Symetrix Inc 6408 216th St SW Mountlake Terrace WA 98043 USA Tel 425 778 7728 Fax 425 778 7727 Website http www symetrixaudio com Email symetrix symetrixaudio com ...

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