Specifications
Performance
Frequency Response: (20Hz-20kHz): ±0.25dB below leveler, compressor and high-frequency limiter thresholds.
RMS Noise: (20Hz-20kHz): <100dB (103dB typical) below 100% peak output level, with high-frequency limiter strapped for flat output.
Interchannel Crosstalk: Better than -74dB at 15kHz, improving below 15kHz.
Noise at Output: <-75dB microseconds. 20-20kHz.
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.
Specifications subject to change without notice.