Equipment information

Orban 412A Converter
Manufacturer
Orban
Model 412A
Date 1984
Category: Professional music equipment
Group Converter
Description Compressor / Limiter
Information
                                    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
File name Orban-9727-Manual-Page-1-Picture
Manual Type Service and User Manual
Pages 45
Size 3.99 Mbytes (4188234 Bytes)
Language english
Revision
Manual-ID/Number 95042-000-04
Date 01 January 1984
Quality Scanned document, all readable.
Upload date
MD5 53e5f013a606a0495c285ead21565e2f
Downloads 5 since 24 October 2017
Information
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
Orban-9727-Manual-Page-1-Picture
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