Orban Optimod-AM 6300 Audio Processor

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Optimod 6300



THE multipurpose Stereo Digital Audio processor for Digital Media

The Orban 6300 is a high-quality, multipurpose stereo audio processor for digital radio, digital television, netcasts, STL protection, satellite uplink protection, and digital mastering.
Orban’s all-digital Optimod 6300 Audio Processor can help you achieve the highest possible quality digital audio broadcast, digital television, and netcast audio processing. Thanks to versatile signal routing, the 6300 can also serve as a studio AGC with an all-digital signal path, and simultaneously as a talent headphone processor.

Because all processing is performed by high-speed mathematical calculations within digital signal processing (DSP) chips, the processing has cleanliness, quality, and stability over time and temperature that is unmatched by analog processors.

OPTIMOD 6300 is descended from the industry-standard OPTIMOD audio processors for radio and television. Thousands of these broadcast-specific processors are attracting and holding audiences all over the world. They have proven that the “OPTIMOD sound” can attract and keep an audience even in the most competitive commercial environment.

Absolute Control of Loudness and Peak Modulation

The 6300 includes third-generation CBS Loudness Controllers™ for DTV appliations. Loudness controllers work with the both Two-Band and Five-Band structures. The third-generation improvements reduce annoyance more than simple loudness control alone, doing so without audible gain pumping. Attack time is fast enough to prevent audible loudness overshoots, so the control is smooth and unobtrusive. Material processed by the CBS Loudness Controller has been shown to be well controlled when measured with a long-term loudness meter using the ITU-R BS.1770-2 standard. The 6300 also includes a “BS.1770 Safety Limiter” that follows the CBS Loudness Controller; use the BS.1770 if the BS.1770-2 meter reading must be constrained to a preset value.

The 6300 also implements “true peak” control by oversampling the peak limiter’s sidechain at 192 kHz. This allows the 6300 to prevent clipping in a playback device’s analog signal path by predicting and controlling the analog peak level following the playback device’s reconstruction filter to an accuracy of better than 0.5 dB. For typical program material, accuracy is 0.2 dB!

Without true peak control, analog clipping can occur even if all peak values of the digital samples are below 0 dBFS. This phenomenon has also been termed “0 dBFS+.”

Thanks to true peak control, sample rate conversion, unless it removes high frequency program energy or introduces group delay distortion, cannot cause sample peaks to increase more than 0.5 dB. For example, sample rate conversion from 48 kHz to 44.1 kHz is highly unlikely to cause sample peak clipping in the 44.1 kHz audio data.

Flexible Configuration

The 6300 includes analog and dual AES3 digital inputs and outputs. The digital input and digital outputs have sample-rate converters and can operate at 32 kHz, 44.1 kHz, 48, 88.2, and 96 kHz sample rates. The pre-emphasis status and output levels are separately adjustable for the analog and digital outputs.

OPTIMOD 6300’s outputs can be independently configured to emit the output of the AGC or the output of the multiband compressor/limiter, all configurable to use or bypass look-ahead limiting. So a 6300 can be configured to drive an STL with a peak-limited output from the AGC while also providing a fully processed digital radio/netcast feed and a low delay, multiband compressed talent headphone feed.


Adaptability through Multiple Audio Processing Structures

The 6300 features two processing structures: 5-band for a spectrally consistent sound with good loudness control, and 2-band for a transparent sound that preserves the frequency balance of the original program material while also effectively controlling subjective loudness.

There are over 60 Factory Presets wich are our “factory recommended settings” for various program formats or types. There are multiple Factory Presets for both radio-oriented and video oriented programming.

Orban’s new PreCode™ technology manipulates several aspects of the audio to minimize artifacts caused by low bitrate codecs, ensuring consistent loudness and texture from one source to the next. There are several factory presets tuned specifically for low bitrate codecs.


The 6300 can be remote-controlled by 5-12V pulses applied to eight programmable, optically isolated “general-purpose interface” (GPI) ports.

Moreover, because the 6300 supports presets that be recalled by remote control, it can be automatically synchronized to the presets on-air at a transmitter side Optimod when presets are dayparted. The 6300’s software can be upgraded by running Orban-supplied downloadable upgrade software on a PC.

Technical Specification

Technical Specification

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.


Specifications apply for measurements from analog left/right input to analog left/right output.

Frequency Response (Bypass Mode): Depending on settings, is flat or follows standard 50µs or 75µs preemphasis curve ±0.10 dB, 20 Hz-20 kHz. (At 32 kHz input sample rate, the passband is reduced to approximately 14.7 kHz.) Analog left/right output and digital output can be user-configured for flat or pre-emphasized output.

Noise: Output noise floor will depend upon how much gain the processor is set for (Limit Drive, AGC Drive, Two-Band Drive, and/or Multiband 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.

Total System Distortion (de-emphasized, 100% modulation): <0.01% THD, 20 Hz-1 kHz, rising to <0.05% at 20 kHz. <0.02% SMPTE IM Distortion.

Polarity (Two-Band and Bypass Modes): Absolute polarity maintained. Positive-going signal on input will result in positive-going signal on output.

Processing Resolution: Internal processing has 24 bit (fixed point) or higher resolution; uses four 150 MHz Motorola DSP56367 DSP chips. All equalizers and crossovers use double-precision arithmetic to achieve mastering-quality processing.

Internal Processing Sample Rate: 48 kHz. Although this rate is not currently fashionable, we believe that it is optimum, pro-audio marketing spin to the contrary. No bias-controlled listening tests (i.e., double-blind with matched levels) have demonstrated that humans can hear the difference between 48 kHz and higher sample rates. Meanwhile, the double-precision equalizers and crossover filters used throughout the 6300 produce at least 6 dB lower noise and nonlinear distortion than they would at 96 kHz.

Delay: The minimum available input/output delay is approximately 23 ms, as determined by the advanced “look-ahead” processing algorithms employed. This can be padded to exactly one frame of 24, 25, 29.97, or 30 frames/second video and can also be adjusted in 1 ms intervals up to 60 ms. The input/output delay to the Headphone Monitor output is approximately 5 ms. (This output has no peak limiting applied to it.)

Operating mode: Stereo or dual-mono. In dual-mono mode, both processing channels have the same subjective adjustments (as determined by the active preset) but are otherwise independent, making this mode appropriate for dual-language processing.


Analog Audio Input

Configuration: Stereo / Dual-Mono.

Impedance: >10kΩ load impedance, electronically balanced.

Nominal Input Level: Software adjustable from -4.0 to +13.0 dBu (VU).

Maximum Input Level: +27 dBu.

Connectors: Two XLR-type, female, EMI-suppressed. Pin 1 chassis ground, Pins 2 (+) and 3 electronically balanced, floating and symmetrical.

A/D Conversion: 24 bit 128x oversampled delta sigma converter with linear-phase anti-aliasing filter.

Filtering: RFI filtered, with high-pass filter at 0.15 Hz (-3 dB).

Analog Audio Output

Configuration: Stereo. Flat or pre-emphasized (at 50µs or 75µs), software-selectable.

Source Impedance: 50Ω, electronically balanced and floating.

Load Impedance: 600Ω or greater, balanced or unbalanced. Termination not required or recommended.

Output Level (100% peak modulation): Adjustable from -6 dBu to +24 dBu peak, into 600Ω or greater load, software-adjustable.

Signal-to-Noise: >= 90 dB unweighted (Bypass mode, de-emphasized, 20 Hz-15 kHz bandwidth, referenced to 100% modulation).

L/R Crosstalk: <= -70 dB, 20 Hz-15 kHz.

Distortion: <= 0.01% THD (Bypass mode, de-emphasized) 20 Hz-15 kHz bandwidth.

Connectors: Two XLR-type, male, EMI-suppressed. Pin 1 chassis ground, Pins 2 (+) and 3 electronically balanced, floating and symmetrical.

D/A Conversion: 24 bit 128x oversampled.

Filtering: RFI filtered.

Digital Audio Input

Configuration: Stereo or Two-Channel (dual-mono) per AES3 standard, 24 bit resolution, software selection of stereo or dual-mono. Unit can detect Stereo or Two-Channel status bits and switch modes appropriately.

Sampling Rate: 32, 44.1, 48, 88.2, or 96 kHz, automatically selected.

Connector: XLR-type, female, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 transformer balanced and floating, 110Ω impedance.

Input Reference Level: Variable within the range of -30 dBFS to -10 dBFS.

J.17 Deemphasis: Software-selectable.

Filtering: RFI filtered.

Digital Audio Output

Configuration: Stereo or Two-Channel per AES3 standard. Output configured in software as flat or pre-emphasized to the chosen processing preemphasis (50µs or 75µs), with or without J.17 preemphasis.

Sample Rate: Internal free running at 32, 44.1, 48, 88.1 or 96 kHz, selected in software. Can be synced at 32, 44.1, 48, 88.1 or 96 kHz to 1x wordclock or AES11id applied to the Sync input or to AES3 or AES11 signals applied to the AES3 digital input.. (Passband is limited to approximately 14.7 kHz when using 32 kHz output sample rate.)

Word Length: 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.

Connector: XLR-type, male, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 transformer balanced and floating, 110Ω impedance.

Output Level (100% peak modulation): -20.0 to 0.0 dBFS software controlled.

Filtering: RFI filtered.

Sync Input

Configuration: Can accept wordclock or AES11id (75Ω) sync, selectable in software.

Connector: Female BNC.

Termination: Unterminated. For wordclock, use an external 75Ω terminator if the 6300 is the last item in the chain. For AES11id, always use a 75Ω terminator.

Remote Computer Interface

Configuration: TCP/IP protocol via direct serial cable connect, modem, or Ethernet interface. Modem is not supplied.

Serial Port: 115 kbps RS-232 port dB-9 male, EMI-suppressed.

Ethernet Port: 100Mbit / sec on RJ45 female connector

Remote Control (GPI) Interface

Configuration: Eight (8) inputs, opto-isolated and floating.

Voltage: 6-15V AC or DC, momentary or continuous. 9VDC provided to facilitate use with contact closure.

Connector: DB-25 male, EMI-suppressed.

Control: User-programmable for any eight of user presets, factory presets, bypass, test tone, stereo or mono modes, analog input, digital input.

Filtering: RFI filtered.


Voltage: 100-264 VAC, 50-60 Hz, 40 VA.

Connector: IEC, EMI-suppressed. Detachable 3-wire power cord supplied.

Grounding: Circuit ground is independent of chassis ground, and can be isolated or connected with a rear panel switch.

Safety Standards: ETL listed to UL standards, CE marked.


Operating Temperature: 32º to 122º F / 0º to 50º C for all operating voltage ranges.

Humidity: 0-95% RH, non-condensing.

Dimensions (W x H x D): 19″ x 1.75 ” x 14.25″ / 48.3 cm x 4.4 cm x 36.2 cm. 1RU.

Humidity: 0-95% RH, non-condensing.

RFI / EMI: Tested according to Cenelec procedures. FCC Part 15 Class A device.

Shipping Weight: 19 lbs / 8.7 kg

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