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It is impossible to characterize the listening quality of even the simplest limiter or compressor based on specifications because such specifications cannot adequately describe the crucial dynamic processes that occur under program conditions. Therefore, the only way to evaluate the sound of an audio processor meaningfully is by subjective listening tests. Certain specifications are presented here to assure the engineer that they are reasonable, to help plan the installation, and make certain comparisons with other processing equipment. |
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Specifications apply for measurements from analog left/right input to stereo composite output and to FM analog left/right output.
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System
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Frequency Response
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Follows standard 50 µs or 75 µs pre-emphasis curve ±0.10 dB, 2.0 Hz – 15 kHz. Analog left/right output and digital output can be user-configured for flat or pre-emphasized output. When configured to emit the digital radio processed signal, the digital output is flat. |
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Noise
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Output noise floor will depend upon how much gain the processor is set for (Limit Drive, AGC Drive, Two-Band Drive, and/or Multi-Band Drive), gating level, equalization, noise reduction, etc. The dynamic range of the A/D Converter, which has a specified overload-to-noise ratio of 110 dB, primarily governs it. The dynamic range of the digital signal processing is 144 dB.
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Total System Distortion
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<0.01% THD, 20 Hz – 1 kHz, rising to <0.05% at 15 kHz. <0.02% SMPTE IM Distortion. |
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Total System L/R Channel Separation |
>50 dB, 20 Hz – 15 kHz; 60 dB typical. |
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Polarity
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Absolute polarity maintained. Positive-going signal on input will result in positive-going signal on output. |
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Processing Sample Rate
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The 8300 is a “multirate” system, using internal rates from 32 kHz to 512 kHz as appropriate for the processing being performed. Audio clippers operate at 256 kHz. | |||||||||||
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Processing Resolution
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Internal processing has 24 bit (fixed point) or higher resolution; uses Motorola DSP56362 DSP chips.
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Analog Audio Input
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Configuration |
Stereo. |
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Impedance |
>10 kΩ load impedance, electronically balanced.
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Connectors |
Two XLR-type, female, EMI-suppressed. Pin 1 chassis ground, Pins 2 (+) and 3 electronically balanced, floating and symmetrical. |
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Nominal Input Level
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Software adjustable from -4.0 to +13.0 dBu (VU). |
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Maximum Input Level
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+27 dBu. | |||||||||||
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A/D Conversion
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24 bit 128x oversampled delta sigma converter with linear-phase anti-aliasing filter. Converter outputs 64 kHz sample rate, which the 8300 then decimates to 32 kHz in DSP using an ultra-high-quality image-free synchronous sample rate converter.
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Filtering |
RFI filtered, with high-pass filter at 0.15 Hz (-3 dB).
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Analog Audio Output
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Configuration |
Stereo. Flat or pre-emphasized (at 50 µs or 75 µs), software-selectable. |
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Source Impedance |
50 Ω, electronically balanced and floating. |
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Load Impedance |
600 Ω or greater, balanced or unbalanced. Termination not required or recommended. |
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Output Level
(100% peak modulation) |
Adjustable from -6 dBu to +24 dBu peak, into 600 Ω or greater load, software-adjustable.
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Signal-to-Noise
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≥ 90 dB unweighted (Bypass mode, de-emphasized, 20 Hz – 15 kHz bandwidth, referenced to 100% modulation).
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Crosstalk
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≤ -70 dB, 20 Hz – 15 kHz.
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Distortion
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≤ 0.01% THD (Bypass mode, de-emphasized) 20 Hz – 15 kHz bandwidth.
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Connectors
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Two XLR-type, male, EMI-suppressed. Pin 1 chassis ground, Pins 2 (+) and 3 electronically balanced, floating and symmetrical. |
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D/A Conversion
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24 bit 128x oversampled, with 64 kHz output sampling rate.
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Filtering
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RFI filtered. |
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Digital Audio Input
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Configuration
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Stereo per AES/EBU standard, 24 bit resolution, software selection of stereo, mono from left, mono from right or mono from sum. |
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Sampling Rate
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32, 44.1, 48, 88.1 or 96 kHz, automatically selected.
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Connector
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XLR-type, female, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 transformer balanced and floating, 110 Ω impedance. |
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Input Reference Level
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Variable within the range of –30 dBFS to –10 dBFS. |
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J.17 De-emphasis
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Software-selectable.
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Filtering
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RFI filtered.
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Digital Audio Output
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Configuration
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Stereo per AES3 standard. Can emit the analog FM or digital radio processed signal. When emitting the FM analog processing signal, the output can be configured in software as flat or pre-emphasized to the chosen processing pre-emphasis (50 µs or 75 µs), with or without J.17 pre-emphasis.
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Sample Rate
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Internal free running at 32, 44.1, 48, 88.1 or 96 kHz, selected in software. Can also be synced to the AES/EBU digital input at 32, 44.1, or 48 kHz, as configured in software.
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Word Length
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Software selected for 24, 20, 18, 16 or 14-bit resolution. First-order highpass noise-shaped dither can be optionally added, dither level automatically adjusted appropriately for the word length.
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Connector
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XLR-type, male, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 transformer balanced and floating, 110 Ω impedance. | |||||||||||
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Output Level
(100% peak modulation) |
-20.0 to 0.0 dBFS, software controlled. | |||||||||||
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Filtering
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RFI filtered.
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Composite Baseband Output
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Configuration
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Two outputs, each with an independent software-controlled output level control, output amplifier and connector.
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Source Impedance
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0 Ω voltage source or 75 Ω, jumper-selectable. Single-ended, floating over chassis ground.
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Load Impedance
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37 Ω or greater. Termination not required.
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Maximum Output Level
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+12.0 dBu (8.72 Vp-p).
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Pilot Level
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Adjustable from 8.0% to 10.0%, software controlled.
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Pilot Stability
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19 kHz, ±0.5 Hz (10 to 40 °C).
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D/A Conversion
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24-bit. | |||||||||||
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Signal-to-Noise Ratio
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≤ –85 dB (Bypass mode, de-emphasized, 20 Hz – 15 kHz bandwidth, referenced to 100% modulation, unweighted).
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Distortion
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≤ 0.02% THD (Bypass mode, de-emphasized, 20 Hz – 15 kHz bandwidth, referenced to 100% modulation, unweighted).
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Stereo Separation
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At 100% modulation = 3.5 Vp-p, > 70 dB, 30 Hz – 15 kHz. At 100% modulation = 1.0 – 8.0 Vp-p, > 60 dB, 30 Hz – 15 kHz. | |||||||||||
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Crosstalk-Linear
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≤ –80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation).
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Crosstalk-Non-Linear
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≤ –80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation).
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38 kHz Suppression
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≥ 70 dB (referenced to 100% modulation). | |||||||||||
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76 kHz & Sideband Suppression
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≥ 80 dB (referenced to 100% modulation).
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Pilot Protection
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–60 dB relative to 9% pilot injection, ±250 Hz (up to 2 dB composite processing drive).
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Subcarrier Protection
(60-100 kHz) |
≥ 70 dB (referenced to 100% modulation; with up to 2 dB composite limiting drive; measured with 800 line FFT analyzer using “maximum peak hold” display).
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57 kHz (RDS/RBDS) Protection
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–50 dB relative to 4% subcarrier injection, ±2.0 kHz (up to 2 dB composite processing drive).
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Connectors
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Two BNC, floating over chassis ground, EMI suppressed.
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Maximum Load Capacitance
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0.047 µF (0 Ω source impedance). Maximum cable length of 100 ft / 30 m RG–58A/U.
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Filtering
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RFI filtered. | |||||||||||
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Subcarrier (SCA) Inputs
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Configuration
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Subcarrier inputs sum into composite baseband outputs before digitally controlled composite attenuator.
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Impedance
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> 600 Ω. | |||||||||||
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SCA1 Sensitivity
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Variable from 220 mV p-p to >10 V p-p to produce 10% injection. Sensitivity is adjustable by an internal PC-board-mounted trimmer.
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SCA2 Sensitivity
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Fixed at 772 mV p-p to produce 10% injection. | |||||||||||
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Connectors
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Two BNC, unbalanced and floating over chassis ground, EMI suppressed.
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19 kHz Pilot Reference
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SCA2 input can be re-jumpered to provide a 19 kHz pilot reference output.
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Remote Computer Interface
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Configuration
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TCP/IP protocol via direct cable connect, modem or Ethernet interface.
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Serial Port
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115 kbps RS–232 port dB–9 male, EMI-suppressed.
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Ethernet Port
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10 or 100 Mbit/s on RJ45 female connector. | |||||||||||
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Remote Control (GPI) Interface
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Configuration
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Eight (8) inputs, opto-isolated and floating.
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Voltage
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6 – 15 VAC or DC, momentary or continuous. 9 VDC provided to facilitate use with contact closure.
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Connector
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DB-25 male, EMI-suppressed.
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Control
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User-programmable for any eight of user presets, factory presets, bypass, test tone, stereo or mono modes, analog input, digital input. | |||||||||||
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Filtering
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RFI filtered. | |||||||||||
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Power
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Voltage
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100 – 132 VAC or 200 – 264 VAC, switch-selected on the rear panel, 50 – 60 Hz, 40 VA.
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Connector
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IEC, EMI-suppressed. Detachable 3-wire power cord supplied.
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Grounding
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Circuit ground is independent of chassis ground can be isolated or connected with a rear panel switch. | |||||||||||
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Safety Standards
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ETL listed to UL standards, CE marked. | |||||||||||
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Environmental
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Operating Temperature
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32 to 122 °F / 0 to 50 °C for all operating voltage ranges.
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Humidity
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0 – 5% RH, non-condensing. | |||||||||||
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Dimensions (W x H x D)
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19” x 3.5” x 14.25” / 48.3 cm x 8.9 cm x 36.2 cm. Two rack units high. | |||||||||||
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RFI / EMI
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Tested according to Cenelec procedures. FCC Part 15 Class A device.
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Shipping Packing
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63 x 57 x 25 cm
Weight: 22 lbs / 10.0 kg |
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Warranty
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Two Years, Parts and Service
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Subject to the limitations set forth in Orban’s Standard Warranty Agreement. | |||||||||||
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| Because engineering improvements are ongoing, specifications are subject to change without notice. |
Last updated:
Dec. 2010 |
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