In the toughest competitive environment ever, a winning strategy includes the OPTIMOD 8700i Audio Processor with Xponential Loudness™

OPTIMOD 8700i is Orban’s flagship broadcast audio processor for both analog FM transmission and digital media (DAB+/HD Radio/Streaming). Providing 2-band as well as 5-band audio processing structures, the 8700i gives you the industry’s most consistent sound, track-to-track and source-to-source. This consistency allows you to create a sonic signature for your station with the assurance that your signature will stay locked in, uniquely branding your sound.

The OPTIMOD 8700i Audio Processor has exclusive features such as Xponential Loudness which brings hyper-compressed music back to life, revealing detail and increasing impact while reducing listening fatigue and distortion. With its Multipath Mitigator phase corrector multipath distortion can be reduced without compromising the stereo separation and thanks to the Subharmonic Synthesizer modern-sounding bass punch can be added to older recordings. It provides you with Orban’s MX limiter technology which lowers distortion, improves transient punch, and minimizes preemphasis-induced high frequency loss. Further outstanding features are the Dante interface which provides dual-redundant AoIP with AES67 support, its digital MPX interface, a built-in streaming server for monitoring purposes and monitored and alarmed dual redundant power supplies as well as safety bypass relays for carefree 24/7 operation.

Audio Processor Quick Setup
This features provides a guided, systematic procedure for setting up your 8700i Audio Processor.

Factory Presets & LESS-MORE Control
The OPTIMOD 8700i comes with a variety of factory presets which you can use as basis to create your own signature sound processing. Orban is happy to help you find the perfect setup for your station. Easy LESS-MORE adjustment of the dynamics processing lets anyone get excellent results, while audio processing experts can fine-tune to their exact preferences with Intermediate or Advanced Control.

Xponential Loudness™ Algorithm
The Xponential Loudness™ algorithm reduces listening fatigue and actually improves listeners’ hearing using adaptive psychoacoustics. It revives music that has been “hypercompressed” in mastering and/or passed through lossy compression, like MP3. It’s like an audio magnifying glass that brings out hidden detail, clarifying audio and inspiring audiences to listen longer.

Subharmonic Synthesizer
The Subharmonic Synthesizer creates energy one octave below program energy in the range of 50-90 Hz when such energy is not present at the input and when music is detected. It adds punch and slam to older material while retaining musicality.

“Multipath Mitigator” Left/Right Phase Skew Correction
Applied to both the analog and digital radio processing chains, the phase skew corrector minimizes L–R energy that can cause multipath distortion while preventing comb filtering in mono receivers and stereo receivers when they blend.

“True Peak” Control
”True Peak” Control is available for the digital radio processing with an accuracy of better than 0.5 dB. For typical program material, accuracy is 0.2 dB.

ITU BS-412 Multiplex Power Control
An improved BS-412 Multiplex Power Controller provides a new user-adjustable, program-adaptive algorithm to make operation smoother and more subtle.

ITU-R BS.1770-3 Loudness Control
Loudness Control is available for digital radio and analog radio processing chains in countries that enforce a BS.1770 loudness limit on digital and/or analog radio broadcasts.

Composite Limiter/Clipper
A patented “Half-Cosine Interpolation” composite limiter providing excellent spectral protection of the pilot tone and SCAs (including RDS). If you prefer the sound of conventional composite clipping, we also offer a defeatable composite clipper with spectral protection for the pilot tone and subcarriers. The composite clipper drives the composite limiter, which serves as an overshoot compensator for the composite clipper when it is active.

SSB Stereo Encoder Operation
Allows its stereo encoder’s stereo subchannel modulator to operate in an experimental compatible single sideband/vestigial sideband mode. In SSB mode, the sub-channel modulator acts as a pure SSB generator for L–R material in the frequency range of 150 Hz to 17 kHz and as a vestigial sideband generator below 150 Hz.

Low-Delay DJ Monitor Output
The MX limiter, Multipath Mitigator, and subharmonic synthesizer add delay that makes it impractical for talent to monitor all of the processing structures off-air with headphones. A new, dedicated headphone monitor chain (with about 6 ms delay) provides a full five-band FM processor that lets you dial in your preferred amount of “FM clipper sound.”

Streaming Monitor Output
Used with the 8700i’s remote control application, the streaming monitor facilitates checking or improving your station’s signature sound when you are unable to receive the 8700i processed FM signal off-air. The steaming feature allows you to monitor several points within 8700i. The MP3 and OPUS codecs and the Icecast2 and SHOUTcast2 streaming protocols are supported, allowing streaming directly to the client PC via your LAN or the Internet.

Dante™ Audio-Over-IP Connectivity
Dante provides a dual-redundant Ethernet connection for two stereo audio inputs and two stereo outputs, each with a dedicated level control. Sample rate conversion is provided for both the inputs and the outputs. Full AES67 compatibility is provided.

Digital MPX
The 384/192 kHz AES3 digital composite output that is compatible and interoperable with the 192 kHz standard being implemented by several transmitter manufacturers.

10 MHz/Wordclock Reference Input
10 MHz/Wordclock Reference Input: A reference input allows the internal DSP clock, the stereo pilot tone frequency and digital composite output sample rate to be locked to a 10 MHz or 1 x wordclock reference signal, facilitating single-frequency-network (SFN) and near-single-frequency-network (N-SFN) operation.

Safety Bypass Relays
Analog and AES3 digital inputs and outputs have hard-wire safety bypass relays in case of hardware or power failures.

Dual Power Supplies
The 8700i’s dual power supplies with independent AC line inputs provide redundant operation to ensuring maximum uptime. Both power supplies are monitored permanently and, in case of failure, an alarm is generated.

The 8700i Audio Processor has a built-in full-featured RDS/RBDS generator that supports static and dynamic RDS values.

Bypass Test Mode and Tone Generator
A Bypass Test Mode can be invoked locally, by remote control or by automation to perform a broadcast system test or to compare easily original and processed sound. A built-in line-up tone generator facilitates quick and accurate level setting.

SNMP Support
The SNMP (Simple Network Management Protocol) feature allows you to monitor your OPTIMOD’s status and to send alarm notifications via your OPTIMOD’s Ethernet connection to your network.

Remote Control or front panel operation
You can operate and configure the 8700i Audio Processor comfortably via the supplied Windows PC Software using your local network or the Internet. Alternatively all functionalities are also available via the front panel with its colored display.

Frequency Response (Bypass Mode; Analog Processing Chain): 
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.

Sample Rate: 
64 kHz to 512 kHz, depending on processing being performed.

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. It is primarily governed by the dynamic range of the A/D converter, which has a specified overload-to–noise ratio of 110 dB. 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 Separation: 
> 55 dB, 20 Hz – 15 kHz; 65 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.

Peak Control at HD Output: 
The peak limiter is oversampled at 256 kHz, yielding a worst- case overshoot of 0.5 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 8700i’s HD lowpass filter cutoff frequency to 15 kHz.)


Defeatable Analog FM Diversity delay: 
0.27 to 12.0 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. The relative delay between the HD/digital radio and analog FM outputs stay constant regardless of the structure in operation. The delay can be changed via 8700i PC Remote software, via SNMP, and via Telnet-style (terminal control) commands through the serial and Ethernet ports. Several manufacturers make HD Radio monitors that can adjust the 8700i’s diversity delay via terminal control to compensate for changes in HD delay that might occur elsewhere in the transmission system. To avoid introducing artifacts in the analog FM path, its delay is held constant and HD delay is varied if the adjustment does not exceed ±1.3 seconds.

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 2-band, depending on crossover structure chosen. MX presets have approximately 270 ms delay. The multipath mitigator adds 146 ms of additional delay, and can be bypassed in situations like outside broadcasts where talent needs to monitor off-air. The defeatable subharmonic synthesizer adds 67.5 ms of delay when active.

Headphone Monitor Processor Delay: 
The low-delay, dedicated headphone monitor processor has 6 ms of delay and provides a complete FM processing chain, including 5-band compressor and distortion-cancelled FM clipper. The clipper drive is adjustable to allow dialing in the preferred amount of “FM clipper sound.”

Analog Audio Input


> 10kΩ load impedance, electronically balanced1.

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

Maximum Input Level: 
+27 dBu.

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.

RFI filtered, with high-pass filter at 0.15 Hz.

Analog Audio Output

Stereo. The analog output can emit the analog FM processed signal, the digital radio processed signal, or the low-delay monitor signal. The FM processed signal can be 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.

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

<= –70 dB, 20 Hz – 15 kHz.

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

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.

RFI filtered.

Hardwire Bypass:
Removing power from the Optimod will connect the left and right audio inputs to the left and right audio outputs via a relay.

Digital Audio Input

Stereo per AES3 standard, 24 bit resolution, software selection of stereo, mono from left, mono from right or mono from sum.

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

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: 

RFI filtered.

Hardwire Bypass:
Removing power from the Optimod will connect the Digital Audio Input to Digital Output #1 via a relay.

Digital Audio Outputs

Two outputs, each stereo per the AES3 standard. The outputs can be set independently 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 HD 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 HD 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 highpass noise-shaped dither can be optionally added, dither level automatically adjusted appropriately for the word length.

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

Output Level (100% peak modulation):
–24.0 to 0.0 dBFS software controlled.

RFI filtered.

Frequency Response (Digital Audio Output driven by HD Processing Chain): 
For output sample rates of 44.1 kHz and above, the frequency response from input to HD-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.

Dante Audio-Over-IP I/O

Fully supports Dante networks. Will be AES67-compliant after field-installable firmware upgrade for the Audinate Ultimo chip, expected Fall 2017 from Audinate. (May require third-party software to facilitate device discovery in non-Dante networks.)

Two L/R stereo inputs and two L/R stereo outputs. The outputs have the same configuration options as the AES3 outputs (above) except for the sample rate.

Sample Rate: 
Inputs and outputs support 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz. Input locks automatically to the incoming sample rate; out sample rate is software-selectable.

2x RJ45, dedicated solely to the audio-over-IP connection. Supports redundant network operation.

Digital Sync Input

Used for synchronization of either or both AES3 signals to an external reference provided at this input.

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

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

RFI filtered.

Hardwire Bypass:
Removing power from the Optimod will connect the Digital Sync Input to Digital Output #2 via a relay.

Wordclock/10 MHz Sync Reference Input

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 single-frequency network operation. The digital output sample frequency can also be locked to these signals.

Unit will lock to 1x wordclock and 10 MHz squarewaves and sinewaves having a peak value of 0.5 V to 5.0 V.

BNC female, grounded to chassis, non-terminating to allow reference signals to be looped through via an external BNC “tee” connector (not supplied).

Composite Baseband Outputs

Number of Outputs: 
2 x analog; 1 x AES3

Subcarrier Modulation Mode: 
Standard double sideband mode or compatible single sideband/vestigial sideband mode with SSB/VSB crossover at 150 Hz. SSB/VSB mode adds approximately 12 ms of delay to the composite output signal.

Two outputs, each with an independent software-controlled output level control, output amplifier and connector.

Source Impedance: 
0Ω voltage source or 75Ω, jumper-selectable. Single-ended, floating over chassis ground.

Load Impedance: 
37Ω or greater. Termination not required or recommended.

Maximum Output Level: 
+12.0 dBu (8.72 Vp-p).

Minimum Output Level: 
–12 dBu (0.55 Vp-p) for 0.5 dB adjustment resolution.

Pilot Level: 
Adjustable from 6.0% to 12.0%, software controlled.

Pilot Stability: 
19 kHz, ±0.5 Hz (10 degrees to 40 degrees C).

D/A Conversion: 

Signal-to-Noise Ratio: 
<= 85 dB (Bypass mode, de-emphasized, 20 Hz – 15 kHz band- width, referenced to 100% modulation, unweighted).

<= 0.02% THD (Bypass mode, de-emphasized, 20 Hz – 15 kHz bandwidth, referenced to 100% modulation, unweighted).

Stereo Separation (analog outputs): 
At 100% modulation = 3.5Vp-p, > 60 dB, 30 Hz – 15 kHz. At 100% modulation = 1.0 – 8.0 Vp-p, > 55 dB, 30 Hz – 15 kHz.

<= –80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation).

<= –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)

Analog composite outputs.

Two BNC, floating over chassis ground, EMI suppressed.

Maximum Load Capacitance: 
0.047µF (0Ω source impedance). Maximum cable length of 100 feet / 30 meters RG–58A/U.

RFI filtered.

AES3 Composite Output

One XLR-type, appearing on breakout cable

Sample Frequency: 
192 kHz

Extension to Interim Industry Standard: 
The composite baseband is internally sampled at 384 kHz and alternate samples are placed on the left and right audio channels. With compatible receiving hardware, this allows the entire baseband frequency range (0 to 99 kHz) to be accommodated without aliasing. If the frequency range of the SCAs applied to the digital output is limited to less than 96 kHz, this is fully compatible and interoperable with the existing system adopted by the industry, which uses only the left channel at 192 kHz.

Subcarrier (SCA) Inputs

Non-Digitized Inputs

SCA Sensitivity (all inputs): 
Variable from 220 mV p-p to > 10 V p-p to produce 10% injection. Sensitivity of analog inputs is screwdriver-adjustable by trim pots that are accessible through holes in the rear panel. Sensitivity of digitizing inputs is adjustable in software.

2 x BNC, unbalanced and floating over chassis ground, EMI suppressed.

Hardwire Bypass:
The SCA1 input can be configured to accept the composite output of a backup audio processor or stereo encoder; removing power from the Optimod will connect this input to analog composite output #1 via a relay.

Digitized Inputs

SCA Sensitivity (all inputs): 
Variable from 220 mV p-p to > 10 V p-p to produce 10% injection. Sensitivity of analog inputs is screwdriver-adjustable by trim pots that are accessible through holes in the rear panel. Sensitivity of digitizing inputs is adjustable in software.

19 kHz Pilot Reference: 
Analog SCA2 input jack can be jumpered to provide a 19 kHz pilot reference output or to serve as a second analog SCA input. The phase of the reference signal can be set to 0°, 90°, 180°, or 270° with respect to the pilot tone appearing at the composite output. The default is 0°.

Remote Computer Interface

Supported Computer and Operating System: 
IBM-compatible PC running Microsoft Windows® Vista/7/8/8.1/10.

TCP/IP protocol via direct cable connect, modem, or Ethernet interface. Modem and other external equipment is not supplied.

Serial Connectors: 
RS–232 port (3) DB–9 male, EMI-suppressed. Serial Connector 1 uses PPP to provide for direct or modem connection to the 8700i PC Remote application. Serial Connector 2 supports communication to a computer or remote control system via simple ASCII commands for administration and recalling presets. Serial Connector 3 is reserved for future developments.

Ethernet Connector: 
Female RJ45 connector for 10-1000 Mbps networks using CAT5 cabling. Native rate is 100 Mbps. Provides for connection to the 8700i PC Remote application through either a network, or, using a crossover Ethernet cable, directly to a computer.

Ethernet Networking Standard: 

Remote Control (GPI) Interface.

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

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

DB-25 male, EMI-suppressed.

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

RFI filtered.

Tally Outputs (x2)

NPN open-collector

Maximum Voltage: 
30 VDC positive. Protected against reverse polarity by a diode; do not exceed 50 mA through this protection diode.

Maximum Current: 
30 mA; current must be limited externally.


100–264 VAC, automatically selected, 50–60 Hz, 50 VA.

Two supplies are included with automatic failover.

IEC, EMI-suppressed x 2. Detachable 3-wire power cord supplied.

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


NPN open-collector

0–95% RH, non-condensing.

Dimensions (W x H x D): 
19” x 5.25” x 15.5” / 48.3 cm x 8.9 cm x 39.4 cm. Depth shown indicates rack penetration; overall front-to-back depth is 17.75” / 45.1 cm. Three rack units high.

0–95% RH, non-condensing.

Tested according to Cenelec procedures.

Shipping Weight & Dimensions: 
30 lbs / 13.6 kg – 25″ x 24″ x 9″


Five Years, Parts and Service: 
Subject to the limitations set forth in Orban’s Standard Warranty Agreement

Because engineering improvements are ongoing, specifications are subject to change without notice.

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