February 25, 2020
February 25, 2020
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48kHz sample rate, meaning that it’s broadcast quality audio as standard.

RAVENNA (of which AES67 is a subset) allows for the distribution of audio across a network. The AVN range use RAVENNA as the communication method providing compatibility with other AES67 systems.

The AVN-TB10AR is a 10 button intercom meaning that 10 other ‘stations’ can be defined, one per button, for communication. Comms can be made as a Talk action, a Listen action or a duplex Talk/Listen action to/from each station. Coloured LEDs in the buttons help to show which action is being used and there is also a Callback button for when you’re unavailable to receive a call.

The stations can be from anywhere on the AoIP network and the use of Bonjour Device Discovery means that other stations can be found quickly and sometimes automatically.

The Page button is used to speak to all stations (or a defined list of stations) and Group Talk functions can be enabled to page particular groups of stations.

Two monitor buttons allow for routing audio directly to the speaker e.g. to take an IFB feed or an off-air transmission signal. Signals can be ducked or mixed when a talkback input is received to the speakers or headphones.

Three user defined buttons can be programmed for different functions, such as for Group Talk.

The speaker mutes automatically when headphones are inserted and the volume level of headphones, speaker and incoming sources can all be controlled with one front panel rotary encoder volume control knob, which shows the level using RGB LEDs around the outside of the knob.

Advanced acoustic echo cancellation & built-in microphone AGC (automatic gain control) ensure that there’s no acoustic feedback between microphone and speaker.

Buttons are available for microphone mute (cough) and speaker mute actions and these can be controlled remotely by GPI or network commands.

Each unit has a built-in webserver which is where the majority of settings and configurations are made. The front panel OLED display can also be used to configure the unit, although more functionality is available by using the webserver. The webserver is a responsive design meaning that it can be used with small screens on smartphones and tablets.

The unit can act as a PTP masterclock or slave clock and supports IEEE1588-2008 PTPv2 media and default profiles.

Front panel LEDs show the AoIP network status, synchronisation status, whether AGC is being used and the status of the AC and DC power supply inputs. The brightness of the OLED display and LED indicators can be adjusted for low or high lighting conditions.

The unit has a front panel power button and dual power connectors – an IEC mains input and a 12V DC input, which allows the AVN-TB10AR to be used for both studio and mobile installations. Also, a secondary power source reduces the effect of power down events. In any case, the unit monitors the status of both power sources and displays this on the front panel.

10 GPIOs (general purpose inputs/outputs) and a programmable relay output can be configured to indicate critical states for the unit, via the 15 way D-type connector, for example, to show loss of DC power, or to show a button press action.

Category: Audio Over IP Products.
Product Function: An advanced talkback/listening/paging intercom unit to enable voice/audio communication between different areas in a facility or building complex.
Typical Applications: OB truck comms, theatre comms, inter-studio comms in a TV or radio station.



  • 10 illuminated key-cap Talk buttons plus Listen & Page buttons.
  • Mic & headset inputs, headphone & speaker outputs with volume control.
  • Sources from AoIP, balanced, 2 x unbalanced or S/PDIF digital inputs.
  • Destinations to AoIP or rear panel balanced & unbalanced outputs.
  • Advanced echo cancellation & mic AGC to prevent acoustic feedback.
  • Dual 1Gb lan ports & 1Gb SFP fibre port.
  • 10 user assignable GPIO ports.
  • Dual AC & DC power supply inputs.
  • Front panel display providing source & destination information.
  • Ethernet webserver and front panel control & configuration.
  • Speaker & microphone mute buttons.
  • Callback button with source display.


AVN Talkback Diagram

Ravenna LogoTalkback Intercoms Using Audio Over IP, RAVENNA/AES 67
Our new range of AVN (Audio/Video/Network) talkback/listening/paging intercoms aid communication between studios, stages, theatres, offices and different areas in a facility or building complex. They have both 4-wire and AoIP sources and destinations, and use RAVENNA/AES67 as the audio transport mechanism, allowing simple CAT 5 cabling and expansion.


Webserver Software

Each AVN-TB talkback unit has a built-in webserver for setup and configuration. The webserver is responsive, and resizes depending on the size of your screen, meaning that it can be used on large monitors or small handheld devices such as smart-phones. Help information is shown on the right hand side of the screen so it’s a good place to go to find out how the unit operates.

AVN screenshot 01


AVN screenshot 02


AVN screenshot 03


AVN screenshot 04


AVN screenshot 05


AVN screenshot 06


Specification For AVN-TB10AR

Audio-Over-IP Specification

Open Standards:RAVENNA, AES67
Device Discovery:Bonjour (mDNS / DNS-SD)
Audio Delivery:RTP/UDP over IPv4 multicast
Stream Management:RTSP/SDP
Format:Linear PCM 24-bit (L24)
Channels Per Stream:2
Frames Per Packet:48
Maximum Streams:RX 15, TX 5 (fixed)
Sample Rate:48 kHz

Timing Synchronisation

Profile Support:Default, media & custom profiles
Timing Protocol:PTPv2, IEEE1588-2008

Technical Specification

Microphone and Headset Input

Input Impedance:>2.5kΩ balanced
Gain Range:0dB to +60dB
0dBFS Line-Up:Adjustable in steps of 3dB from -58dBu to +2dBu
Frequency Response:20Hz to 20kHz, +0/-0.2dB
Noise:-127dBu, 20kHz BW, Rs=200Ω ref. 76dB gain

Unbalanced Line Inputs

Input Impedance:>20kΩ
0dBFS Line-Up:+12dBu
Frequency Response:20Hz to 20kHz, +0/-0.2dB
THD+N:<-97dBFS, -30dBFS, 20Hz to 20kHz, unity gain, 20kHz BW
Noise:-100dBFS, 20kHz BW, Rs=200Ω

Balanced Line Inputs

Input Impedance:>20kΩ balanced
0dBFS Line-Up:Adjustable +15/+18/+20/+22/ +24dBu
Frequency Response:20Hz to 20kHz, +0/-0.2dB
THD+N:<-110dBFS, -30dBFS, 20Hz to 20kHz, 20kHz BW
Noise:-110dBFS, 20kHz BW, Rs=200Ω
Common Mode Rejection:>70dB @ 1kHz

Headphone Output

Output Impedance:Drives 150mW into 32Ω to 600Ω headphones
0dBFS Line-Up:+20dBu
Frequency Response:20Hz to 20kHz, +0/-0.2dB
THD+N:<-108dBFS, -30dBFS, 20Hz to 20kHz, unity gain, 20kHz BW
Noise:-110dBFS, 20kHz BW

Unbalanced Line Outputs

Output Impedance:<50Ω
0dBFS Line-Up:+12dBu
Frequency Response:20Hz to 20kHz, +0/-0.2dB
THD+N:<-95dBFS, -30dBFS, 20Hz to 20kHz, unity gain, 20kHz BW
Noise:-100dBFS, 20kHz BW

Balanced Line Outputs

Output Impedance:<50Ω balanced
0dBFS Line-Up:Adjustable +15/+18/+20/+22/ +24dBu
Frequency Response:20Hz to 20kHz, +0/-0.2dB
THD+N:<-110dBFS, -30dBFS, 20Hz to 20kHz, 20kHz BW
Noise:-110dBFS, 20kHz BW, Rs=200Ω


Power Output:4W
Volume:Mute to full volume via front panel control


Microphone:XLR-3 pin female (electronically balanced)
Headphone:¼ inch (6.35mm) stereo jack socket
Headset:2 x XLR-5 pin female (front/rear electronically balanced input)
Audio Inputs:2 x unbalanced stereo, RCA phono
1 x S/PDIF, RCA phono
Audio Outputs:1 x balanced stereo, RJ45
1 x unbalanced stereo, 2 x RCA phono
1 x loudspeaker output
Audio Input/Output:1 x balanced stereo input or mono input/output, RJ45
GPIO:15-way ‘D’-type socket
Network:2 x gigabit Ethernet, RJ45
1 x SFP fibre
Mains AC Input:Universal filtered IEC, continuously rated 85-264VAC, 47-63Hz, 20W
DC Input:4 pin 7.5A power jack socket, 9.5-14VDC
Fuse Rating:Anti-surge fuse 2A 20mm x 5mm

Equipment Type

AVN-TB10AR:10 channel rackmount talkback intercom control unit with RAVENNA AoIP

Physical Specification

Dimensions: (Raw)48.3cm (W) x 17.5cm (D) x 4.4cm (H)(1U)
19” (W) x 6.9” (D) x 1.8” (H) (1U)
Dimensions (Boxed):59cm (W) x 28cm (D) x 11cm (H)
23” (W) x 11” (D) x 4.3” (H)
Weight:Nett: 2.4kg   Gross: 3.1kg
Nett: 5.3lbs  Gross: 6.8lbs


AVN-DC060:60W DC power supply for AVN range with KPJX-4S plug
CM-GM1:Professional Gooseneck Condenser Microphone


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