Radius AEC

… a complete audio AEC solution in a single box …  

Radius AEC with Composer and ARC-WEB

A complete audio AEC solution in a single box.  8 AEC inputs, 4 aux inputs, 8 outputs, an expansion slot for any Symetrix audio I/O option card, Dante network port.

Superior AEC for superior intelligibility.  A complete audio AEC solution in a single box. Dedicated wide band processing. Zero latency direct outputs. Discrete references. Input from mic/line or internally routed signal. Unique features that combine to deliver perfect sound to far end participants. 8 AEC inputs, 4 aux inputs, 8 outputs.

Scalable Dante™ network audio – 64×64.  For projects of any size, Dante™ digital audio over Ethernet is an industry standard method used to interconnect Radius, Prism, and Edge DSP’s, Symetrix analog I/O expanders, and a growing range of select Dante equipped third-party devices including microphones, loudspeakers, power amps, mixing consoles, and computers.

On-board 10/100 and gigabit switches.  Unique to Symetrix Radius and Edge DSP’s, built in switches lower system cost, reduce complexity, help to eliminate third-party peripherals while increasing system reliability.

AEC + any other required processing.  In addition to dedicated AEC processing Radius AEC reserves an entire Sharc DSP chip for all the other processing requirements in and around the conference room: voice lift, room combine, mic and speaker EQ profiles, feedback fighter, automixing, and more. Everything in a single box.

More usable I/O in one unit.  The addition of a versatile option card slot reduces total system costs by maximizing the number of inputs or outputs in a single 1U DSP. For example, adding a 4 Channel Analog Input card creates a 16×8 analog configuration; with a 4 Channel Analog Output card the result is 12×12. The expansion slot supports an array of audio I/O cards including 4-channel analog, 4-channel digital, 4-channel AEC and multi-line VoIP and analog telephone.

Control made easy.  Multiple control options include the zero cost ARC-WEB browser interface, low-cost Symetrix ARC wall panels, and an easy to generate SymVue Windows GUI. A stable, human readable protocol is used to program third-party touch screens.

Multiple user control options.  Zero cost ARC-WEB browser based interfaces, low cost Symetrix ARC wall panels, easy to implement SymVue GUI executable for Windows machines, and programmable third-party touch screens.

Powerful, efficient DSP configured using award winning CAD design software*.  Composer software processes audio and control signals in nearly unlimited ways serving countless applications. Unique to Composer is the ability to natively configure Symetrix along with select third party Dante hardware – thereby eliminating the confusion of multiple or redundant software applications. Learn more about Symetrix Composer Here.

 Winner of Sound & Video Contractor – Best of Show InfoComm 2014

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Radius AEC Front
Radius AEC Rear

General Specifications

Processor 1 x Analog Devices SHARC 21489 @ 400 MHz SIMD.
Raw processing capacity 400 MIPS, 1.6 GFLOPS.
Sampling rate 48 kHz, ± 100 ppm.
Frequency response (A/D/A) 20 Hz – 20 kHz, ± 0.5 dB.
Dynamic range (A/D/A) > 114 dB, A-weighted.
Channel separation (A/D/A) > 108 dB @ 1 kHz, +24 dBu.
Latency (A/D/A) 0.88 mS, inputs routed to outputs.
Delay memory 174 mono seconds.
Analog control inputs 0-3.3 VDC.
Recommended external control potentiometer 10k Ohm, linear.
Logic outputs Low (0V) when active, pulled high (5V) when inactive.
Logic output maximum external power supply voltage / current sinking 24 VDC / 50 mA.
Logic output maximum output current 10 mA.
THD + Noise < -85 dB (unweighted); 1 kHz @ +22 dBu with 0 dB gain.
RS-232 accessory serial I/O 57.6 kbaud (default), 8 data bits, 1 stop bit, no parity, no flow control wired straight-through, only pins 2, 3, and 5 required.
RS-485 serial I/O 38.4 kbaud (default) 8 data bits, 1 stop bit, no par- ity, no flow control. May be broken out of ARC port.
Ethernet Cable Standard CAT5/6, maximum device to device length = 100 meters.
Dante Cable Standard CAT6, maximum device to device length = 100 meters.
ARC Cable Standard CAT5/6, distance dependent upon load and number of devices.
Maximum stored presets 1000.

Analog Inputs

Connectors 3.81 mm terminal blocks.
Number of inputs 12 total; 8 switchable balanced mic or line level with dedicated AEC, 4 line level.
Nominal input level +4 dBu with 20 dB of headroom.
Maximum input level +23 dBu
Mic Pre-amp Gain (Inputs 1-8) 0, 11.8, 24, 44 or 54 dB switchable with ± 24 dB trim.
Mic Pre-amp EIN (Inputs 1-8) < -127 dB with 150 Ohm source impedance.
CMRR > 76 dB @ 1 kHz, unity gain.
Input impedance 8 k Ohms balanced, 4 k Ohms unbalanced.
Phantom Power (Per Input, Inputs 1-8) +48 VDC @ 10 mA maximum.
Dynamic range > 115 dB, A-weighted.
THD + Noise < -94 dB, unweighted; 1 kHz @ +22 dBu with 0 dB gain.
Latency 0.28 mS (direct), 11 mS (AEC enabled, Inputs 1-8).
Tail Length (Inputs 1-8) > 250 mS
Convergence Time (Inputs 1-8) > 100 dB/S

Analog Outputs

Connectors 3.81 mm terminal blocks.
Number of outputs Eight (8) balanced line level.
Nominal output level +4 dBu with 20 dB of headroom.
Maximum output level +24 dBu (+22.8 dBu into a 2 k Ohm minimum load).
Output impedance 300 Ohms balanced, 150 Ohms unbalanced.
Dynamic range > 117 dB, A-weighted.
THD + Noise < -95 dB, unweighted; 1 kHz @ +22 dBu with 0 dB gain.
Latency 0.60 mS.

Mechanical Data

Space Required 1U (WDH: 18.91 in. x 9.5 in. x 1.72 in. / 48.02 cm x 24.13 cm x 4.37 cm). Depth does not include connector allowance. Allow at least 3 inch additional clearance for rear panel connections. Additional depth may be required depending upon your specific wiring and connections.
Electrical 100-240 VAC, 50/60 Hz, 45 Watts maximum universal input and/or suitable 24 VDC / 2.0 Amp auxillary power source. No line voltage switching required.
Ventilation Maximum recommended ambient operating temperature is 30 C / 86 F. Ensure that the left and right equipment sides are unobstructed (5.08 cm, 2 in. minimum clearance). The ventilation should not be impeded by covering the ventilation openings with items such as newspapers, tablecloths, curtains, etc.
Shipping Weight 13 lbs. (5.9 kg).
Certifications or Compliance UL 60065, cUL 60065, IEC 60065, EN 55103-1, EN 55103-2, FCC Part 15, RoHS.

Architect and Engineer Specifications: SymNet RADIUS AEC.

The device shall provide twelve inputs, eight analog mic/line inputs with dedicated acoustic echo cancelling, that are adjustable from line to mic level with coarse gain, fine trim, phantom power, invert and mute, and four analog line level that are adjustable +4 dBu or -10 dBV nominal with fine trim, invert and mute; plus eight analog line outputs that are adjustable +4 dBu or -10 dBV nominal with fine trim and mute. Levels, phantom powers, signal inversions and mutes shall be controllable via software. Audio connections shall be accessed via rear panel 3.81 mm terminal block connectors.

An option card slot may accommodate either a 2 Line analog telephone interface card, 4 channel digital input card, 4 channel digital output card, 4 channel mic/line input card, 4 channel AEC input card, 4 channel analog output card, or remain empty.

Network audio expansion shall be provided by the Dante protocol with a capacity of 128 (64×64) channels. Primary and Secondary Dante network audio connections shall be provided for redundant network implementation. Connectors shall be gigabit RJ45 utilizing CAT5/6 cable.

A designer software application shall be provided that operates on a Windows computer, with network interface installed, running Windows® XP or higher operating system. Computer connection for configuration shall be via the device’s rear panel Ethernet connector. All internal processing shall be digital (DSP). Available DSP components shall include (but not be limited to) various forms of: mixers, equalizers, filters, crossovers, dynamics/gain controls, routers, delays, remote controls, meters, generators, onboard logic, and diagnostics.

The front panel shall include input and output signal level indicators, indication of installed option card type, as well as indicators for POWER, ARC, RS-232, NETWORK, and DANTE (PRIMARY and SECONDARY). Additionally, a front panel LCD shall display certain system parameters as well as allow editing of network parameters and may be programmed as an ARC for custom user control via the front panel UP, DOWN, LEFT, RIGHT and ENTER buttons.

External control shall include dedicated software screens as well as preset selection, I/O level control and muting using the optional ARC wall panel remote controls via industry-standard CAT5/6 cable with RJ45 connectors. A built-in web server shall provide four instances of ARC-WEB, which allows for user control from nearly any web browser or mobile device. Logic I/O shall consist of eight contact closure or four potentiometer inputs along with eight logic outputs. The logic outputs may be used to drive LEDs directly or control external relays or switchers. All program memory shall be non-volatile and provide program security should power fail. The device shall provide an on board real time clock to facilitate automatic, timed changing of presets and may sync to NTP. Third-party control systems may interface over IP and RS-232 using a published ASCII control protocol.

Audio conversion shall be 24-bit, 48 kHz and internal processing shall be 32-bit or 40-bit floating point, 48 kHz. The dynamic range shall not be lower than 115 dB, A-weighted with a maximum input level of +23 dBu and maximum output level of +24 dBu.

The device shall have an IEC power input socket for 120-240 VAC. The device shall meet UL/CSA and CE safety requirements and comply with CE and FCC Part 15 emissions limits. The two line-analog telephone interface shall comply with FCC Part 68. The device shall be RoHS compliant. The chassis shall be constructed of cold rolled steel and molded plastic, and mount into a standard 19” 1U EIA rack. The device shall be a Symetrix SymNet RADIUS AEC. 

Dante™ in our DNA


In 2007 Symetrix recognized the need for a standardized, high performance digital audio networking protocol – not only for our own products but for the pro audio industry at large. After considerable research, we aligned with Audinate to become one of the earliest licensees of the Dante protocol. The choice has proven prescient. Legacy protocols like Cobranet have faded into obscurity. Newer protocols, AVB for example, have failed to gain traction due to inherent technical drawbacks. With hundreds of third party licensees and a list of commercially available products that is growing exponentially, Audinate’s Dante protocol is now an established standard, far and above any competition.

Since the introduction of our first Dante enabled product in August 2012, we’ve leveraged the benefits of the protocol for our own box-to-box audio networking, as well as for peer-to-peer connection with major third parties including Yamaha, Shure, and AudioTechnica. In countless case studies, designers have used inexpensive off-the-shelf switches and cabling to link Symetrix DSPs to Dante-enabled mixing consoles, microphones, power amplifiers, loudspeakers, and laptop computers.

Dante is in our DNA … and that has placed us in a highly advantageous position. While our competitors choose to design for and support multiple network audio protocols, in some cases proprietary, Symetrix designs for and supports only one ubiquitous and clearly accepted industry standard: Audinate’s Dante. The Symetrix Dante Advantage provides our customers with a network audio solution that is flexible, dependable, scalable, and supportable. In short, just what you’d expect from an industry standard … and just what you’d expect from Symetrix.

Dante is Economical and Versatile

Dante does away with heavy, expensive, analog or multicore cabling, replacing it with low-cost, readily available CAT5e, CAT6, or fiber optic cables. Using Dante’s logical routes instead of physical point-to-point connections, a network can be expanded and reconfigured at any time.

Symetrix Dante systems scale from a simple pairing of a DSP and an analog I/O expander, to multi-DSP distributed networks. In countless case studies system designers have used Dante to easily connect Symetrix DSPs and analog I/O expanders to third-party Dante equipped mixing consoles, microphones, power amplifiers, loudspeakers, and computers.

Outstanding Quality

Using the Dante protocol, Symetrix transmits and receives uncompressed full bandwidth audio with up to 32 bits of resolution at a 48kHz sample rate. Since audio is transmitted and received digitally there’s no need to face the common analog challenges of interference from other electrical equipment, crosstalk between cables, or signal degradation over long cable runs.

Glitch-Free Redundancy

Symetrix Radius, Prism, Edge, xIn 12, and xOut 12 Dante-enabled products support glitch–free redundancy, enabling a secondary physical network to duplicate the audio traffic on the primary network, automatically preventing audio loss or interruption in the event of a connectivity problem on the primary network.

Unicast or Multicast

Dante audio channels can be configured as unicast or multicast to make the best use of available bandwidth. Unicast provides a direct point-to-point stream for unique channels; multicast sends an audio stream to multiple devices simultaneously.

Easy to Program

Composer is the Windows® application used to program Symetrix Dante equipped DSPs and analog I/O expanders. In addition to the programming of Symetrix devices, Composer also natively configures the setup and routing of select third-party Dante endpoints. Integrators can design a complete end-to-end DSP signal path using just one application.

Dante Virtual Soundcard

With Dante Virtual Soundcard, Windows or Mac OS X computers become a Dante interface to Symetrix DSPs for recording and media playback. Dante Virtual Soundcard (DVS) uses the computer’s Ethernet port — no additional hardware is required. Digital Audio Workstations, software-based media players, Skype, iTunes, Pandora, Spotify, and other applications are easily integrated into a network using the DVS which can be downloaded directly from the Audinate website.

User Interfaces

  • ARC-2e Front with Aluminum Faceplate
  • ARC-3 Front
  • ARC-EX4e Front
  • ARC-K1e Front
  • ARC-PSe Front and Rear
  • ARC-SW4e Front
  • RC-3 Front
  • xControl Front and Rear

Dante I/O Expanders

I/O Expansion Cards

Interconnect Cables


  • House of Worship SymVue Screen