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General| Brand | Orban |
|---|---|
| Model | 674A |
| Category | Stereo Equalizer |
| Language | English |
Details on input and output impedance, nominal levels, and frequency response.
Overview of the active RC design with FET-input opamps and discrete current booster.
Specifies the operational temperature range for the unit.
Details the power voltage, frequency, and consumption of the equalizer.
Information on controls, panel dimensions, chassis depth, weight, and connectors.
Overview of the 674A's features, dual-channel design, and applications.
Key features like 8-band EQ, +/-16dB range, reciprocal curves, and tunable filters.
Explanation of controls like GAIN, OVERLOAD indicator, EQ IN/OUT, EQ controls, TUNING, and BANDWIDTH.
Details on fuse, input/output connectors (barrier strip, XLR, phone plugs).
Information on voltage strapping (115/230V) and power cord grounding.
Requirements for rack mounting space and environmental considerations.
Instructions for installing optional XLR or phone jack connectors.
Compatibility with balanced/unbalanced sources, nominal level, and overload point.
Describes unbalanced outputs and use of MAIN/LOWPASS and HIGHPASS outputs.
Recommended wiring practices using two-conductor shielded cable and grounding.
Guidance for using single-conductor shielded cables, often with phone plugs.
How to use the parametric EQ bands, including tuning, bandwidth, and boost/cut.
Operation of HP/LP filters, their role in crossovers, and special effects.
Instructions for configuring the unit as a bi-amped electronic crossover.
Procedure for matching stereo channels for precise imaging and mono summing.
Versatile use in reinforcement systems for tuning, notch filtering, and crossovers.
EQ adjustments for dance club sound, including bass boost and room tuning.
Using the parametric EQ for cleaning up tracks, notch filtering hum, and general sweetening.
Application in film sound for dialog equalization, noise reduction, and scoring.
Use in AM/FM/TV broadcasting, RF suppression, and transformer recommendations.
Application as a formant filter, resonator, and for synthesizer sound shaping.
Guide to maintaining the unit, checking specifications, and troubleshooting.
Bench tests and procedures to verify normal operation and specifications.
Procedure for setting DC offsets, required for IC replacement.
Guidelines for cleaning, access, special tools, and component replacement.
Methods for diagnosing faulty IC opamps based on voltage measurements.
Information on warranty, service procedures, and return authorization.
Guidelines for packing the unit for return or transport.
Describes the balanced input stage, RF filtering, and differential amplifier.
Explains the series-leapfrog topology of the eight EQ bands and their operation.
Details the function of the EQ bypass switch and its impact on gain.
Describes the Sallen and Key HP filter design and output stage.
Describes the Sallen and Key LP filter design and output stage.
Explains how the overload detection circuit works and triggers the lamp.
Details the unregulated and regulated voltage stages, transformer strapping.
Guidance on connecting to high impedance sources and RF bypass capacitors.
Explains the principles of circuit and chassis grounding for noise reduction.
Information on ordering replacement parts and recommended procedures.
List of vendor codes and their corresponding company names.
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