The clarity and punch of Optimod-FM 8600Si processing, now available in a compact package.
Optimod-FM 8600 was a hit as soon as it was introduced. Compared to Orban's previous flagship, the 8600's dramatically improved "MX" peak limiter technology decreased distortion while increasing transient punch and high frequency power handling capacity. A significant number of broadcasters have asked us to make the 8600’s sound available in a compact package at a lower price. Orban’s response is the 8600Si, which offers 8600-class sound in a single rack unit. An efficient, switching power supply ensures that the 8600Si runs cool even in a crowded rack. The 8600Si includes simultaneous processing for FM and for digital transmissions like netcasts, DAB+ and HD Radio.
The 8600Si provides stereo enhancement, equalization, AGC, multiband compression, low-IM peak limiting, stereo encoding, and composite limiting — everything that even the most competitive major market station needs to stand out on the dial. More than 20 excellent sounding, format specific factory presets get you started. You'll find all of your favorite 8500 presets, plus the 8600 "MX" presets designed by Bob Orban and Greg Ogonowski to exploit the exciting possibilities inherent in the 8600Si's peak limiter technology. Although the factory presets are fully competent "out of the box”. You can customize them with easy one-knob LESS-MORE control. Full Control gives you the versatility to customize your audio further. Orban’s Quick setup, which is a guided sequence of screens through the 8600Si‘s setup, is the easiest way to have your station On Air quickly.
- An LCD and full-time LED meters make setup, adjustment and programming of OPTIMOD-FM easy — you can always see the metering while you are adjusting the processor. Navigation is by dedicated buttons, soft buttons (whose functions are context-sensitive), and a large rotary knob. The LED’s show all metering functions of the processing structure (Two-Band or Five-Band) in use.
Absolute Control of Peak Modulation
- The 8600Si provides universal transmitter protection and audio processing for FM broadcast. It can be configured to interface ideally with any commonly found transmission system in the world, analog or digital.
- The 8600Si provides pre-emphasis limiting for the internationally used pre- emphasis curves of 50μs and 75μs. Compared to its predecessor, its new clipping/pre-emphasis control technology preserves 2.5 to 3 dB more frequency energy while significantly reducing audible clipping distortion at all frequencies. This produces a clean, open sound whose subjective brightness more closely matches the original program.
- The 8600Si achieves extremely tight peak control at all its outputs—analog, AES3 (for both the analog FM and HD channels), and composite baseband.
- The stereo encoder has two outputs with independent level controls, each capable of driving 75Ω in parallel with 47,000pF, (100ft / 30m of coaxial cable).
- By integrating the stereo encoder with the audio processing, the 8600Si eliminates the overshoot problems that waste valuable modulation in traditional external encoders.
- The 8600Si prevents aliasing distortion in subsequent stereo encoders or trans- mission links by providing bandwidth limiting and overshoot compensated 15 kHz low-pass filters ahead of the 8600S’s audio outputs and stereo encoder.
- The 8600Si has an internal, DSP-based stereo encoder (with a patented “half-cosine interpolation” composite limiter operating at 512 kHz sample rate) to generate the pilot tone stereo baseband signal and control its peak level. The composite limiter is a unique, “you can only do this in DSP” process that beats composite clippers by preserving stereo imaging while fully protecting the stereo pilot tone, RDS/RBDS, and subcarriers. The stereo encoder’s stereo sub-channel modulator can operate in normal double sideband mode and in an experimental compatible single sideband mode that is offered to enable users to compare and assess the two modes.
- The Digital Radio and analog radio processing chains offer ITU-R BS.1770-3+ Loudness Meters and Safety Limiters for use in countries that enforce a BS.1770 loudness limit on digital and/or analog radio broadcasts.
- The 8600Si implements “true peak” control in its HD processing chain by oversampling the HD peak limiter’s sidechain at 256 kHz. This allows the 8600 to prevent clipping in a playback device’s analog signal pathby 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.
- A built-in RDS/RBDS encoder supports the most important RDS features and can be associated with processing presets so that mixed-format stations can automatically update the “program type” field to complement the programming by recalling a audio processing preset for a given program type.
- OPTIMOD-FM 8600Si is supplied with analog and AES3 digital inputs and outputs. The digital input and the two digital outputs are equipped with samplerate converters and can operate at 32 kHz, 44.1 kHz, 48 kHz, 88.1 kHz, and 96 kHz sample rates. The pre-emphasis status and output levels are separately adjustable for the analog and digital outputs. Each output can emit the analog FM processed signal, the analog FM processed signal with diversity delay applied, the digital radio processed signal, or the low-delay monitor signal.
- A loop-through connection is provided to enable a ratings encoder (such as Arbitron®) to be inserted between the output of the audio processing and the input to the stereo encoder. . In “ratings encoder loop-through mode,” the sec- ond digital output drives the ratings encoder from the output of the FM processing.
- Failsafe switching detects loss of audio on the primary input, which you can assign to be the analog or digital input. If audio is lost on the primary input, the 8600Si can switch automatically to the secondary input.
- The 8600Si has two independent equalizers, multiband compressors, and peak limiters for the FM analog and digital media processing channels, allowing you to separately optimize the processing for each.
- An AES11 sync input allows you to synchronize the output sample rate of either (or both) AES3 outputs to this input. You can also synchronize the outputs to the AES3 digital input or to 8600Si’s internal clock. The sync source of each AES3 output is independently selectable.
- A de-featable diversity delay can delay the FM analog processing output up to 16.2 seconds. Delay can be trimmed in intervals of one sample of 64 kHz to match the analog and digital paths in the HD Radio system, eliminating the need to use the delay built into the HD Radio exciter and permitting the 8600Si’s internal stereo encoder and composite limiter to drive the analog FM exciter. Each output (Analog, Digital 1, Digital 2, Composite) can be independently configured to emit the delayed or non delayed signal.
- The analog inputs are transformerless, balanced 10kΩ instrumentation- amplifier circuits. The analog outputs are transformerless balanced and floating (with 50Ω impedance) to ensure highest transparency and accurate pulse response.
- The 8600Si has two independent composite baseband outputs with digitally programmable output levels. Robust line drivers enable them to drive 100 feet of RG-59 coaxial cable without audible performance degradation.
- The 8600Si’s two subcarrier inputs are mixed with the output of the 8600S’s stereo encoder before application to the composite output connectors. One in- put can be re-jumpered to provide a 19 kHz pilot reference output. Both inputs have internal level trims to accommodate subcarrier generators with output levels as low as 220 mV.
- The 8600Si precisely controls the audio bandwidth of its analog FM processing to 16.5 kHz. This prevents significant overshoots in uncompressed digital links operating at a 44.1 kHz-sample rate or higher and prevents interference to the pilot tone and RDS (or RBDS) subcarrier. The bandwidth of the 8600Si’s digital radio output is adjustable in 1 kHz increments between 15 kHz and 20 kHz.
- The 8600Si has a de-featable multiplex power limiter that controls the multiplex power to ITU-R BS412 standards. An adjustable threshold allows a station to achieve maximum legal multiplex power even if the downstream transmission system introduces peak overshoots into the 8600S-processed signal. Because this limiter closes a feedback loop around the audio processing, it allows the user to adjust the processor’s subjective setup controls freely without violating BS412 limits, regardless of program material. The multiplex power limiter acts on all outputs (not just the composite output). In its most common configuration, it reduces clipper drive when it reduces power, simultaneously reducing clipping distortion. However, to accommodate customers who wish to use heavier clipping to achieve a certain sound, the MPX power controller can be configured to reduce gain after the clippers.
- All input, output, and power connections are rigorously RFI-suppressed to Orban’s traditional exacting standards, ensuring trouble-free installation.
- The 8600Si is designed and certified to meet all applicable international safety and emissions standards.
Adaptability through Multiple Audio Processing Structures
- A processing structure is a program that operates as a complete audio processing system. The 8600Si realizes its processing structures as a series of high- speed mathematical computations made by Digital Signal Processing (DSP) chips.
- The 8600Si features six processing structures. Four of these are the same as Optimod-FM 8500: Five-Band (or “Multiband”) for a consistent, “processed” sound with 17 ms delay (typical), free from undesirable side effects, Low-Latency Five-Band (12 ms delay), Ultra-Low-Latency Five-Band (3.7 ms delay), and Two-Band (17 or 22 ms delay) for a transparent sound that preserves the frequency balance of the original program material. A special Two-Band preset creates a no-compromise “Protect” function that is functionally similar to the “Protect” structures in earlier Orban digital processors.
- The 8600Si’s two “MX” structures (five-band and two-band) are similar to their 8500 counterparts except that they use the 8600S’s new peak limiting technology to decrease distortion while achieving substantial improvements in transient punch and high frequency clarity. This advanced technology requires more input-to-output delay than the older structures, so it is impractical for talent to monitor these structures off-air with headphones The 8600Si offers a special low-delay monitor output for this purpose.
- The 8600Si can increase the density and loudness of the program material by multiband compression, limiting, and clipping—improving the consistency of the station’s sound and increasing loudness and definition remarkably, without pro- ducing unpleasant side effects.
- The 8600Si rides gain over an adjustable range of up to 25 dB, compressing dynamic range and compensating for both operator gain-riding errors and gain in- consistencies in automated systems.
- The 8600Si’s Two-Band processing structures can be made phase-linear to maximize audible transparency.
- The 8600Si can be remote-controlled by 5-12V pulses applied to eight programmable, optically-isolated “general-purpose interface” (GPI) ports available at the REMOTE INTERFACE connector on the rear panel.
- 8600Si PC Remote software is a graphical application that runs under Windows 2000/XP/Vista/7/8/8.1 and 10. It communicates with a given 8600S via TCP/IP over modem, direct serial, and Ethernet connections. You can configure PC Remote to switch between many 8600Sis via a convenient organizer that supports giving any 8600Si an alias and grouping multiple 8600Sis into folders. Clicking a 8600Si’s icon causes PC Remote to connect to that 8600Si through an Ethernet network, or initiates a Windows Dial-Up or Direct Cable Connection if appropriate. The PC Remote software allows the user to access all 8600Si features (including advanced controls not available from the 8600Si’s front panel), and allows the user to archive and restore presets, automation lists, and system setups (containing I/O levels, digital word lengths, GPI functional assignments, etc.).
- The 8600Si contains a versatile real-time clock, which allows automation of various events (including recalling presets) at pre-programmed times. The clock can be set automatically from an Internet timeserver.
- A Bypass Test Mode can be invoked locally, by remote control (from either the 8600Si’s GPI port or the 8600Si PC Remote application), or by automation to permit broadcast system test and alignment or “proof of performance” tests.
- Silence alarm and digital audio fault tally outputs are available.
- The 8600Si contains a built-in line-up tone generator, facilitating quick and accurate level setting in any system.
- The 8600Si's software can be upgraded by running Orban-supplied downloadable upgrade software on a PC. The upgrade can occur remotely through the 8600Si’s Ethernet port or serial port (connected to an external modem), or locally (by connecting a Windows® computer to the 8600Si’s serial port through the supplied null modem cable).
Frequency Response (Bypass Mode): Follows standard 50μs or 75μs 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.
Noise: 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.
Total System Distortion (de-emphasized, 100% modulation): <0.01% THD, 20 Hz–1 kHz, rising to <0.05% at 15 kHz. <0.02% SMPTE IM Distortion.
Total System L/R Channel Separation: >50 dB, 20 Hz – 15 kHz; 60 dB typical.
Polarity (Two-Band and Bypass Modes): Absolute polarity maintained. Positive-going signal on input will result in positive-going signal on output when HD Polarity and FM polarity controls are set to POSITIVE.
Processing Sample Rate: The 8600Si is a “multirate” system, using internal rates from 64 kHz to 512 kHz as appropriate for the processing being performed. Audio clippers operate at 256 kHz (and are anti-aliased), while the composite limiter operates at 512 kHz.
Peak Control at HD Output: The peak limiter is oversampled at 256 kHz, yielding a worst case overshoot of 0.4 dB at the analog output and for all output sample rates. (To achieve this performance at 32 kHz output sample rate, it is necessary to set the 8600Si’s HD lowpass filter cutoff frequency to 15 kHz.)
- De-featable Analog FM Processing delay: 0.27 to 16.384 seconds, adjustable in one- sample increments at 64 kHz sample rate to allow the delays of the analog and digital paths in the HD Radio system to be matched at the receiver output.
- Minimum Processing Delay: Processing structure dependent. Typically 17 ms for normal latency Five band, 13 ms for low-latency Five-band, 3.7 ms for ultra-low-latency Five- band, and 17 or 22 ms for two band, depending on crossover structure chosen. MX presets have approximately 270 ms delay.
Analog Audio Input
- Configuration: Stereo.
- Impedance: >10kΩ load impedance, electronically balanced1.
- Nominal Input Level: Software adjustable from –9.0 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.
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, with high-pass filter at 0.15 Hz (–3 dB).
- Filtering: RFI filtered.
Digital Audio Input
- Configuration: Stereo per AES3 standard, 24 bit resolution, software selection of stereo, mono from left, mono from right or mono from sum.
- 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 De-emphasis: Software-selectable.
- Filtering: RFI filtered.
Digital Audio Outputs
- Configuration: Two outputs, each stereo per the AES3 standard. The outputs can be independently set to emit the analog FM processed signal, the digital radio processed signal, or the low-delay monitor signal. The FM processed signal can be configured in software as flat or pre-emphasized to the chosen processing pre-emphasis (50μs or 75μs). The digital radio processing chain receives the output of the multiband limiter and processes it through a look-ahead peak limiter that operates in parallel with the main FM peak limiting system. The DR and FM signals are always simultaneously available. Each output can apply J.17 pre-emphasis if desired.
- Sample Rate: Internal free running at 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, or 96 kHz, selected in software. (Use 44.1 kHz or higher for best peak control.) Can also be synced to the AES3 SYNC input or the AES3 digital input at 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz, as configured in software.
- Word Length: Software selected for 24, 20, 18, 16 or 14-bit resolution. First-order high pass 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 trans- former balanced and floating, 110Ω impedance.
- Output Level (100% peak modulation): –20.0 to 0.0 dBFS software controlled.
- Filtering: RFI filtered.
- Frequency Response (Digital Audio Output (from Digital Radio Processing Chain)): For output sample rates of 44.1 kHz and above, the frequency response from input to DR-configured output is ±0.10 dB, 2.0 Hz - 20 kHz; flat or with J.17 pre-emphasis applied. The user may specify lowpass filtering to constrain the bandwidth to 15, 16, 17, 18, or 19 kHz. ,Br> Relative Time Delay between FM and HD Outputs: Depends on setting of analog processing channel diversity delay. Once set, this delay is constant regardless of processing preset in use.
Wordclock/10 MHz Sync Reference
- Configuration: Accepts 1x wordclock or 10 MHz reference signals, automatically selected. The DSP master clock can be phase-locked to these signals, which in turn phase-locks the 19 kHz pilot tone frequency, facilitating singe-frequency network operation. The digital output sample frequency can also be locked to these signals.
- Level: Unit will lock to 1x wordclock and 10 MHz square waves and sine waves having a peak value of 0.5 V to 5.0 V.
- Connector: BNC female, grounded to chassis, non-terminating to allow reference signals to be looped through via an external BNC “tee” connector (not supplied).
- Configuration: The Wordclock/10 MHz Sync Reference can also be configured as an AES3id digital audio input to drive the input of the stereo encoder. This facilitates a “ratings encoder loop-through” connection, where the input of the ratings encoder is driven from one of the 8600Si’s AES3 outputs and the encoder’s output is returned to the AES3id input. When not being used in ratings encoder loopthrough mode, this input can receive an AES3id or AES11id sample rate reference signal to which the 8600Si’s digital outputs can be locked.
- Connector: BNC female, grounded to chassis, terminated with 75Ω. For short cable runs, there is usually no problem in driving this with an AES3 (110Ω) signal. If the cable is long enough to cause digital audio reception errors due to impedance mismatch, a 110Ω/75Ω transformer should be placed in-line.
Composite Baseband Outputs
- Configuration: Two outputs, each with an independent software-controlled output level control, output amplifier and connector.
- Source Impedance: 0Ω voltage source or 75Ω, jumper-selectable.
- Load Impedance: 37Ω or greater. Termination not required or recommended.
- Maximum Output Level: +16.0 dBu (13.82Vp-p).
- Pilot Level: Adjustable from 6.0% to 12.0%, software controlled.
- Pilot Stability: 19 kHz, ±1.0 Hz (10 degrees to 40 degrees C).
- D/A Conversion: 24-bit
- Signal-to-Noise Ratio: >= 85 dB (Bypass mode, de-emphasized, 20 Hz – 15 kHz band- width, referenced to 100% modulation, unweighted).
- Distortion: <= 0.02% THD (Bypass mode, de-emphasized, 20 Hz – 15 kHz bandwidth, referenced to 100% modulation, unweighted).
- Stereo Separation: >50 dB, 20 Hz – 15 kHz; 60 dB typical.
- Crosstalk-Linear: <= –80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation).
- Crosstalk-Non-Linear: <= –80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation).
- 38 kHz Suppression: >= 70 dB (referenced to 100% modulation).
- 76 kHz & Sideband Suppression: >= 80 dB (referenced to 100% modulation).
- Pilot Protection: 60 dB relative to 9% pilot injection, ±250 Hz (up to 2 dB composite processing drive).
- 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).
- 57 kHz (RDS/RBDS) Protection: 50 dB relative to 4% subcarrier injection, ±2.0 kHz (up to 2 dB composite processing drive).
- Connectors: Two BNC, shell connected to chassis ground, EMI suppressed.
- Maximum Load Capacitance: 0.047 microfarad (0Ω source impedance). Maximum cable
length of 100 feet/30 meters RG–58A/U.
- Filtering: RFI filtered
Subcarrier (SCA) Inputs
- Configuration: Two subcarrier inputs sum directly into composite baseband outputs; COMP X LVL control settings have no effect on the absolute subcarrier levels.
- Impedance: 600Ω
- SCA Sensitivity: Variable from <100 mV p-p to >10 V p-p to produce 10% injection assuming 100% modulation = 4 V p-p at the 8600Si’s composite outputs. Rear-panel accessible PC-board-mounted trim pots allow user to adjust the sensitivities of the two SCA in- puts.
- Connectors: Two BNC, shell connected to chassis ground, EMI suppressed.
- 19 kHz Pilot Reference: SCA2 input can be re-jumpered to provide a 19 kHz pilot reference output.
Remote Computer Interface
- Supported Computer and Operating System: IBM-compatible PC running Microsoft Windows® Configuration: TCP/IP protocol via direct cable connect, modem, or Ethernet interface. Suitable null modem cable for direct connect is supplied. Modem and other external equipment is not supplied.
- Serial Connector: RS–232 on DB–9 male connector, EMI-suppressed. Uses PPP to provide for direct or modem connection to the 8600Si PC Remote application.
- Ethernet Connector: Female RJ45 connector for 10 Mbps and higher networks using CAT5 cabling. Native rate is 100 Mbps. Provides for connection to the 8600Si PC Re- mote application through either a network, or, using a crossover Ethernet cable, directly to a computer.
- Ethernet Networking Standard: TCP/IP.
Remote Control (GPI) Interface
- Configuration: Eight (8) inputs, opto-isolated and floating.
- Voltage: 6–15V AC or DC, momentary or continuous. +12VDC 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.
- Circuit Configuration: Two NPN open-collector outputs.
- Voltage: +15 volts maximum. Do not apply negative voltage. When driving a relay or other inductive load, connect a diode in reverse polarity across the relay coil to protect the driver transistors from reverse voltage caused by inductive kickback.
- Current: 30 mA maximum
- Indications: Tally outputs can be programmed to indicate a number of different operational and fault conditions, including Input: Analog, Input: Digital, Analog Input Silent, AES In- put Silent, and AES Input Error.
- Voltage: 85–264 VAC, 50–60 Hz, <30 VA.
- Connector: IEC, EMI-suppressed. Detachable 3-wire power cord supplied.
- Fuse: 2.5A 20mm Quick Acting HBC, mounted on the power supply circuit board.
- Grounding: In order to meet EMI standards, circuit ground is hard-wired to chassis ground.
- Safety Standards: ETL listed to UL standards, CE marked.
- Operating Temperature: 32° to 122° F / 0° to 50° 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 4.5 cm x 36.2 cm. One rack unit high.
- Humidity: 0–95% RH, non-condensing.
- RFI/EMI: Tested according to Cenelec procedures. FCC Part 15 Class A device.
- Shipping Weight: 10 lbs / 4.6 kg
- Five Years, Parts and Service: Subject to the limitations set forth in Orban's Standard Warranty Agreement.