Aphex-systems 320A Manuel d'utilisateur

Owner’s ManualDual Mono/Stereo Automatic Level Controller Manual P/N 999-0760 • Revision 2 • 09/30/03Copyright 2003 Aphex Systems Ltd. All rights res

320ACompellorPage 104.1 UnpackingYour Compellor was packed carefully at the factory in a container designed to protect the unit during shipment. Neve

320DCompellorPage 10 Page 114.4 Power CordThe Compellor uses a standard IEC power cord set. The appropriate mains plug for each country is normally

320ACompellorPage 12Installation should be performed only by qualified individuals. It is the installer’s responsibility to insure his personal safet

Page 13The output impedance of 65 ohms is optimized for driving long cables and consequently .htgnel yna fo ,decnalabnu ro decnalab ,

320ACompellorPage 145.1 INPUTSConnector: 3 pin XLR femaleType: transformerless, servo balanced, RFI fIlteredImpedance: 22K-ohms balanced,

Page 155.6 RATIOCompressor: 1.1:1 to 3:1 program dependentLeveler: 20:1Limiter: >30:15.7 ATTACK TIMESCompressor: 5 to 50mSec program

320ACompellorPage 166.1 IntroductionThe “Quick Start” guide in the front of this manual is the best way to begin using your Compello

Page 17has too wide a dynamic range, it can cause broadcast processors (if the processing does not include the Compellor) to work too hard and generat

320ACompellorPage 18numerous other devices which effectively control the level differences, but none have the transparency of the Compello

Page 19 6.13 Hard Disk RecordingTransferring music to hard disk can be improved using a Model 320D. It is a known fact that CD’s are mastered at varyi

Page 2Fast FinderFast Finder1Contents2Quick Start3Introduction4Installation5Specications66Operating Instructions7System Description8 9Warranty &

320ACompellorPage 20-7.1 Signal FlowThe Compellor contains an input stage, an intermediate VCA stage, and an output stage. The input audio signal un

Page 217.4 Compressor FunctionThe compressor cooperates with the leveler to supply more consistent program level control than possible with the levele

320ACompellorPage 22ground noise, but below the lowest program signal expected. Typically, a setting of -30dB (at about 9 o’clock) is satisfactory fo

Page 237.14 Output ControlThis control allows you to normalize the output level to 0VU after the processing is set up. It will usually get set aroun

320ACompellorPage 247.19 Gain Reduction MeteringWhen the Meter Select is toggled into “G.R.” the bi-color LED meter is programmed to indi-cate a bar g

320ACompellorPage 258. Warranty & Service 8.1 Limited WarrantyPERIODOne year from date of purchaseSCOPEAll defects in workmanship and materials.

320ACompellorPage 269. Appendiceslines are the same. They both need two conductors. What makes a system unbalanced is when one of the wires

320ACompellorPage 27is cancelled out by the dierential amplier. Figure 1 illustrates how the hum is induced into both wires equally and there

320ACompellorPage 28There are basically three ways to attack the prob -lem of a ground loop. First is to eliminate it from its sourc

Page 29Appendix C: Proper Wiring TechniquesA true balanced line should be used wherever your equipment allows. Use “twisted pair” shielded cable

320ACompellorPage 32. Quick Start - Page 63. Introduction - Page 7 3.1 What Is A Compellor? 3.2 What Does It Do? 3.3 How Does It Work? 3.4 A BIt Of C

320ACompellorPage 30audio line from a low impedance and receive into a high impedance. Generally, a minimum 1: 10 ratio is possible. This is calle

Page 31output circuit. We strongly recommend that you refer to your various equipment manuals to nd out what is used in each case before hooking up t

320ACompellorPage 32PART 2: BALANCED OUT to UNBALANCED INIt was mentioned that there are several types of balanced output stages in use tod

Page 33Stereo PlugMale XLRFemale XLRDon’t Connect Pin 3Ground Shield This End OnlyGround Shield This End OnlyTo 207Insert JackTo Equipment InputFrom E

320ACompellorPage 34Appendix E: About Reference LevelsANALOG SYSTEMSSystems declaring the average reference level are very different than systems decl

Page 35In a world where all audio levels would be monitored by VU meters, this SMPTE standard would make things simple. Since VU meters measure some

320ACompellorPage 36Appendix FDigital–vs–Analog; Peak–vs–RMSHow To Deal With The ConfusionBy Donn Werrbach • 10/03/03The ConfusionThe matter of audio

Page 37room above the maximum PPM indication. By controlling the audio levels to maintain good PPM readings, there can be no possibility of the e

320ACompellorPage 38Digital Audio’s Contributions to the ProblemDeath of a Perfectly Good VU MeterAs superior as the VU monitor is for general audio w

Page 39Appendix FMost simply stated, the Compellor will accept an audio input, digital or analog, level it out and add some compression

320ACompellorPage 46. Operation - Page16 6.1 Introduction 6.2 Recording 6.3 Mixing 6.4 Mastering 6.5 VIdeo Post Production 6.6 Sound Reinforceme

320ACompellorPage 40outputs into the codec, the level will then shift and be louder with the analog input. That may give the effect of a fuller on-air

Page 41

320DCompellorPage 4 Page 5

320ACompellorPage 6You can use this quick setup to get a signal through your Compellor right away. Then. you’ll want to go on and read through the man

Page 7 3.1 What Is A Compellor?A Compellor is the first and only product designed specifically for the transparent control of audio levels. While ot

320ACompellorPage 8circuit. They thought that all audio processors should be noticeable. We had to explain that the unit was in fact working,

Page 9 In 1994, Aphex introduced the current Compellor Models 320A and 323A. The model “A” revision signifies the inclusion of an improv