Sonifex AVN-TB6D 6 Button Talkback Intercom, Desktop

Vendor: Sonifex
Sonifex AVN-TB6D 6 Button Talkback Intercom, Desktop A six-channel talkback intercom control device from Sonifex's AVN line of IP-based solutions is the AVN-TB6D. The desktop model, AVN-TB6D, can be installed flush into a...

Sonifex AVN-TB6D 6 Button Talkback Intercom, Desktop

A six-channel talkback intercom control device from Sonifex's AVN line of IP-based solutions is the AVN-TB6D. The desktop model, AVN-TB6D, can be installed flush into a work surface if necessary. Additionally, there is a standalone model that can be installed on a rack using the AVN-TB6RK 1U rack kit. Both models have comparable functionalities. This machine uses RAVENNA/AES67 as the transport mechanism to enable broadcast-quality audio communication between studios, offices, and other places inside a facility or building complex. This allows for easy CAT 5 wiring and extension. Audio can be distributed across a network using RAVENNA, of which AES67 is a subset. RAVENNA is the communication protocol used by the AVN series, which allows for compatibility with other AES67 systems. The AVN-TB6D has six channels that can be set up to communicate with other distant networked units. If necessary, a separately programmable "page" feature can be used to prioritize contacting certain devices over regular intercom calls.

The audio from an AoIP source can be sent to the speaker and headphones via a monitor channel. You could use this to listen to any audio source or to receive an IFB feed or an off-air transmission signal. A voltage-free relay contact can be utilized to run external equipment, and a user-configurable GPIO system with 10 physical and 10 virtual ports can be used to drive outputs when specified states change or control operational operations on local or networked machines. 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-TB6D has a built-in web server for setup and configuration. The web server 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 smartphones. 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.

Key Features

  • 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 of Ethernet webserver.
  • AVN-TB6RK 19” rack kit available.

Audio-Over-IP Specification

Open Standards: RAVENNA, AES67
Device Discovery: Bonjour (mDNS / DNS-SD)
Audio Delivery: RTP/UDP over IPv4 multicast
QoS: DiffServ
Stream Management: RTSP/SDP
Control: Ember+/Webserver
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
Port: 9000

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-TB6D: 6 channel desktop talkback intercom control unit with RAVENNA AoIP

Physical Specification

Dimensions: (Raw) 22.2cm (W) x 17cm (D) x 11.5cm (H) (1U)
8.7" (W) x 6.7"(D) x 4.5" (H) (1U)
Dimensions (Boxed): 41cm (W) x 31cm D) x 23cm (H)
16" (W) x 12" (D) x 9" (H)
Weight: Nett: 1.8kg Gross:2.6kg
Nett: 4.0llbs Gross:5.7llbs


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