Summary
Studio Chassis
The 8200ST provides transparent gain riding, adjustable compression, high-frequency limiting and absolute peak control. Applications include STL protection, studio level control and budget FM processing. A variable density control which can be used for inconspicuous gain riding, to increase punch and density for a louder sound, or to create any desired effect in between. The high-frequency limiter is adjustable for all standard pre-emphasis curves.
Application
Features
- GAIN REDUCTION over a 25dB range is adjustable from slow, easy AGC to high density compression for a punchier more consistent sound.
- VOICE mode activates a second level controller that accelerates overshoot protection for better control of voice dynamics.
- HF LIMITER, adjustable from OFF to 150µs, ensures that peak output signal is controlled to match the pre-emphasis of the link or recording medium.
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- ALIGNMENT TONE GENERATOR is useful during system setup to calibrate the 8200ST to the device being driven and the OPTIMOD at the transmitter.
- PEAK CONTROLLER prevents peak overmodulation of the link.
- STEREO or MONO; For stereo, gain control can be coupled to preserve a balanced stereo image or uncoupled to correct poorly balanced stereo programs.
- ADVANCED METERING; The precision dual LED MODULATION metering provides true peak-reading capability, capturing pulse durations of as little as 10µs with a typical accuracy of 0.05dB. The dual GAIN REDUCTION meters accurately display up to 25dB of gain reduction in each channel.
Technical Specification
Technical Specification
Performance
Frequency Response:
(20Hz-20kHz): ±0.25dB below leveler, compressor and high-frequency limiter thresholds.
RMS Noise:
(20Hz-20kHz):
Interchannel Crosstalk:
Better than -74dB at 15kHz, improving below 15kHz.
Noise at Output:
Gain:
0dB, ±0.5dB.
Installation
Audio Input
Impedance:
>10k ohms active-balanced, EMI-suppressed.
Operating Level:
Usable with -10dBu to +8dBu average level lines. Maximum peak input level +27dBu. (0dBu=0.775VRMS; for this application, the dBm @ 600 ohms scale on voltmeters can be read as if calibrated in dBu.)
Connectors:
Female XLR.
Audio Output
Impedance:
30 ohms electronically-balanced and floating to simulate true transformer output. Minimum load impedance is 600 ohms. Output can be unbalanced by grounding pin 2 or 3 of output XLR.
Level:
Front panel adjustable for 100% peak output level up to +24dBu.
Connector:
Male XLR.
Circuitry
Level Controller:
Attack Time:
Approximately 200ms (VOICEmode OFF), 5ms (VOICEmode ON); program-dependent.
Release Time:
Adjustable between approximately 1dB/sec; program-dependent. Rate declines exponentially when less than 10dB gain reduction occurs.
Compression Ratio:
>20:1 (static); program-dependent (dynamics).
Range of Gain Reduction:
>25dB.
Interchannel Tracking:
±0.5dB (with COUPLE button set ON).
Total Harmonic Distortion (100% Modulation):
<0.05% at 1kHz (with RELEASE control centered and 15dB gain reduction). Typically <0.1% at 20Hz, <0.03% from 100Hz-2kHz, 0.05% from 2-10kHz and <0.1% from 10-20kHz.
SMPTE Intermodulation Distortion:
<0.05% (60Hz/7kHz 4:1 with 15dB gain reduction).
Gain Reduction Element:
Class-A VCA.
HF Limiter
Pre-emphasis:
Five switch-selectable 6dB/octave pre-emphasis curves: 25 microseconds, 50 microseconds 75 microseconds, 100 microseconds and 150 microseconds. Can be strapped for flat or pre-emphasized output.
Response:
The high-frequency limiting threshold and attack time have been set so that no audible distortion is produced with dynamic program material that has been processed by the leveler/compressor and peak controller. Because these settings have taken into account the peak-to-average ratio of the level compressor’s output, it is not possible to specify the high-frequency limiter’s response to test tones with simple, meaningful numbers.
Total Harmonic Distortion:
The high-frequency limiter/clipper will add no more than 0.02% THD to sine wave test tones that have been processed by the leveler/compressor.
Release Time:
Approximately 30ms, program-dependent.
Interchannel Coupling: Each channel’s high-frequency limiter operates independently at all times. (The use of fast release times precludes disturbances of the stereo image’s stability.)
Gain Reduction Element:
Junction FET.
HF Limiting Curve:
Shelving, 6dB/octave.
Peak Controller
Attack Time:
Instantaneous.
Release Time:
Instantaneous.
Peak Control Element:
Soft clipping diodes. The 8200ST’s level controller and high-frequency limiter circuitry control average level sufficiently below the threshold of peak control to prevent audible distortion in the clipping process.
Physical
Buttons:
Momentary with power-failure keep-alive feature to preserve COUPLE and VOICE logic settings (Unit always powers up with TONEOFF and AGC ON.)
Metering:
Four 10-segment LED bargraph displays show gain reduction and modulation level for each channel.
Indicators:
Two LEDs show operation of gating or high frequency limiting. Other indicators (e.g., COUPLE) light when their respective buttons are enabled (ON).
Power Requirements:
115/230 volts AC ±10%, 50-60Hz, 16VA. IEC-standard detachable mains cord. EMI-suppressed.
Fuse:
1/2 -amp 3AG 250V Slow-Blow for 115V operation; 1/4-amp “T”-type (250mA) Slow-Blow for 230V operation.
Mounting:
Requires 1 unit (1.75″/4.5cm) of vertical space in an EIA 19″/48.3cm rack. Depth is 9.625″/24.5cm.
Operating Temperature Range:
32-113 degrees F (0-45 degrees C).
Limited Warranty:
One year, parts and labor. Subject to the limitations set forth in Orban’s Standard Warranty Agreement
