|Orban 412A Converter|
|Category||Professional music equipment|
|Description||Compressor / Limiter|
The Orban Model 412A/414A Compressor/Limiter is a general-purpose AGC device of highest professional quality. It can perform compression and peak limiting simultaneously with unusual freedom from side-effects. The flexibility and natural sound of the 412A/414A make it applicable in virtually all areas of professional audio: recording studios, broadcasting, sound reinforcement, public address, motion picture sound, etc. However, it is not optimized for overmodulation protection of broadcast transmitters; the Orban OPTIMOD-AM, -FM, or -TV should be used in such applications. The product is available in both single- (412A) and dual- (414A) channel versions. (For clarity, only the 414A will be referenced in this manual.) The dual-channel version is equipped with a coupling switch which forces the gain of both channels to be equal, tracking the channel demanding the greatest amount of gain reduction. This preserves correct imaging in stereo applications. However, the stereo coupling switch does not couple the operating controls, and these are ordinarily set identically in stereo operation. (If they are set non-identically, the gain of both channels will still be equal, tracking the channel demanding the highest amount of G/R. However, the control circuitry will respond differently to material in the two channels even if a mono feed is used. This might be useful for special effects.) Attack and release times are both program-controlled, but can be scaled faster or slower by means of front-panel controls. This results in maximum flexibility, plus extremely natural sound over a wide range of control settings. The 414A Compressor/Limiter is equipped with electronically-balanced input and output, and is compatible with the levels and impedances found in both professional and semi-professional applications. RF suppression applied to the input, output, and power leads enables use in relatively high RFI fields such as those common in broadcasting. Because the front-panel controls are marked in a familiar way, you may be tempted to jump right in without reading the manual. However, if you take the time to review the Description And Function Of Front-Panel Controls and Operating Instructions in Part C, you will find that there is "more than meets the eye" inside the 414A, and that the time you take reading the manual will be well-rewarded by a greater understanding of the unit's potential.
These manuals are available for the above equipment:
|Orban -- 412A -- Service and User Manual|
|Manual Type||Service and User Manual|
|Size||3.99 Mbytes (4188234 Bytes)|
|Date||01 January 1984|
|Quality||Scanned document, all readable.|
|Upload date||24 October 2017|
|Downloads||33 since 24 October 2017|
1 PART A: INTRODUCTION I Performance Highlights 3 Front-Panel Description 3 Rear-Panel Description 5 PART B: INSTALLATION 5 Mechanical Installation 5 Installation Of Options 5 Fig. B-l: Wiring Of Optional Connectors 6 Electrical Installation 6 AC Power 6 Fig. B-2: AC Line Cord Color Coding 6 Control Loop Bass Rolloff Jumper 7 Fig. B-3: Control Loop Bass Rolloff Strapping 7 Audio Connections 7 Input 7 Output 8 Preferred Wiring 8 Fig. B-4: Grounding 8 Table 1: General Input/Output Connection Rules 9 Wiring The 414A With Single-Conductor Shielded Cable II PART C: OPERATING INSTRUCTIONS 11 Quick Operating Guide 12 Fig. C-l: Output Level As A Function Of Input Level For Various Settings Of The RATIO Control 15 Description and Function of Front-Panel Features 17 Using The Compressor/Limiter 17 Some Specific Applications 17 Sidechain Processing 17 De-Essing 18 Frequency-Selective Limiting 18 Stereo And Multichannel Operation 18 Speech-Activated Ducking Of Music 21 PART D: MAINTENANCE 21 Introduction 21 ALIGNMENT AND PERFORMANCE VERIFICATION 21 General 21 Power Supply 22 Signal Processing Circuitry 25 MAINTENANCE AND SERVICE 25 Preventive Maintenance 25 Corrective Maintenance 25 Service Access 26 Lamp Replacement 26 Component Replacement 26 Replacement Parts 27 Replacement Of Components On Printed Circuit Boards 27 Removal 27 Installation 27 Troubleshooting IC Opamps 28 Factory Service 29 Shipping Instructions 29 CIRCUIT DESCRIPTION 29 General 29 Input Buffer 30 Voltage-Controlled Amplifier (VCA) Operation 30 Current-Controlled Gain 31 Exponential Converter 31 Compressor/Limiter Circuitry 31 General 31 Rectifier With Threshold 33 Timing Module 33 Threshold-Setting Circuitry and RATIO Control 33 Gain Reduction Meter 34 Line Amplifier 34 Power Supply 35 APPENDIX A: INTERCONNECTIONS AND GROUNDING 35 Driving The Input From High-Impedance And/Or High-Level Sources 35 Grounding 37 APPENDIX B: SPECIFICATIONS 39 PARTS LIST 44 Vendor Codes 45 ASSEMBLY DRAWING 46 SCHEMATIC DIAGRAM
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