February 25, 2020
February 25, 2020
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This unit provides broadcast quality audio communication between studios, offices and different areas in a facility or building complex, using RAVENNA/AES67 as the transport mechanism, allowing simple CAT 5 cabling and expansion. 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.

Each of the 6 channels on the AVN-TB6 can be configured to provide communications with other remote networked units, and an independently configurable ‘page’ function can contact selected units with priority over standard intercom calls if required.

There is a monitor channel that can route the audio from an AoIP source to the headphones and speaker. This could be used to take an IFB feed or an off-air transmission signal or simply to listen to any audio source.

A user configurable GPIO system, with 10 physical ports and 10 virtual ports, can be used to control operational functions on local or networked units, or drive outputs as selected states change, and a voltage free relay contact can be used to operate external equipment.

A built-in web server provides complete configuration control of the units and also allows for firmware updates and configuration backup. An Ember+ interface also gives access to the configuration options as well as providing remote control and monitoring of the GPIO and virtual GPIO ports.

Webserver Software

The AVN-TB6 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.

Category: AES67/Dante AoIP Products.
Product Function: Provides broadcast quality audio communication using RAVENNA/AES67 as the transport mechanism, allowing simple CAT 5 cabling and expansion.
Typical Applications: Ideal for broadcast quality audio communication between studios, offices and different areas in a facility or building complex.



  • 6 illuminated key-cap Talk buttons plus Listen & Page buttons.
  • Dual 1Gb Ethernet & 1Gb SFP port.
  • Mic & headset inputs, headphone & speaker outputs with volume control.
  • Loudspeaker & Mic Mute buttons.
  • Dual AC & DC power supply inputs.
  • Advanced echo cancellation & mic AGC to prevent acoustic feedback.
  • 10 user assignable GPIO ports.
  • Responsive design Ethernet webserver.
  • AVN-TB6RK 19” rack kit available.


AVN Talkback Diagram

Specification For AVN-TB6

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
Transit Streams:1 (fixed)
Sample Rate:48 kHz

Ember+ Interface Connection

Interface Type:Provider
Network Interface:Ethernet port and AoIP port

Timing Synchronisation

Profile Support:Default, AES67 Media & Custom profiles
Timing Protocol:PTPv2, IEEE1588-2008

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

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


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:1 x XLR-5 pin female (electronically balanced input)
GPIO:15-way ‘D’-type socket
Network:2 x gigabit Ethernet, RJ45 1 x SFP
Mains AC Input:Universal filtered IEC, continuously rated 85-264VAC, 47-63Hz, 20W
DC Input:4 pin 7.5A power jack socket, 10-14VDC
Fuse Rating:Anti-surge fuse 2A 20mm x 5mm

Equipment Type

AVN-TB6:6 channel freestanding talkback intercom control unit with RAVENNA AoIP

Physical Specification

Dimensions: (Raw)25.5cm (W) x 19.4cm (D) x 4.4cm (H) (1U)
10.1” (W) x 7.7” (D) x 1.8” (H) (1U)
Dimensions (Boxed):33cm (W) x 26cm (D) x 17cm (H)
13” (W) x 10.3” (D) x 6.7” (H)
Weight:Nett: 2kg Gross: 3kg
Nett: 4.4lbs Gross: 6.6lbs


AVN-DC060:60W DC power supply for AVN range with KPJX-4S plug
AVN-TB6RK1U Rack Kit
CM-GM1:Professional Gooseneck Condenser Microphone


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