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APT Multi-Channel Audio over IP Codec


Professional IP STLs for audio delivery

The APT MULTI-CHANNEL CODEC is a compact and efficient solution for the transport of multiple channels of audio content over IP links. It can support up to 16 channels of audio within a single unit of rackspace - and even more IP streams when using multicast or multiple unicast technology.

The 1RU frame can accommodate up to 4 AoIP modules, each equivalent to a stand-alone stereo duplex codec combining audio, dual IP transport and auxiliary data on board. 

It offers the entire range of audio formats and modes meeting the audio industry’s requirements: simplex, duplex, AES/EBU, AES/EBU with analog backup, analog with HI/LO or 600Ω impedance. 

A Dante Interface module option also enables direct connect to Dante or AES67 networks.


Current Version: 4.0.11


Product Benefits

Performance icon

Powerful Performance

  • Supports up to 16 channels of Audio in 1RU and even more IP streams with Multicast or Multiple Unicast
  • Outstanding audio quality with low delay, cascade-resilient aptX Enhanced
  • Many other standards & coding options available
  • Robust DSP-based platform for mission-critical operation
  • Redundant Power Supplies as standard, no single point of failure
  • Hot-swappable cards enable uninterrupted audio
  • Support of Specific-Source Multicast (SSM)
  • 192/128kHz Sampling supports Digital MPX/Composite over AES and fully digital transfer
Control icon

Powerful Control

  • NTP System Time option for program time-alignment on multiple Decoder sites
  • User-configurable suite of audio, link, sync and PSU alarms
  • Supports the majority of protocols in compliance with Tech 3326 standard for IP compatibility
  • Support for SNMP
  • Support VLANs and virtual IP interfaces for flexible network integration
  • Network security features with firewall capability
Savings icon

Powerful Savings

  • Flexible & modular system that can scale according to your requirements
  • up to 4 AoIP modules, each  equivalent to a stand-alone stereo duplex codec in a 1U rack space
  • SureStream Technology* for ultra-reliable delivery over affordable public IP connections
  • Seamless, affordable migration from T1/E1 to IP networks using same frame
  • Optional Dante Interface enabling direct connection to Dante /AES67 network

Product Highlights

Feature-Packed. Multiple Modules.

APT multichannel front
APT multichannel back
AoIP module

AoIP module

AoIP module Rear view

AoIP module Rear view

MPX/composite module

MPX/composite module


Dual Stream Redundancy

Enhanced with SureStream, the APT Multi-Channel Codec offers 
dual stream redundancy for optimal reliability, zero drop outs, zero jitter, lowest latency

APT SureStream Technology is a revolutionary innovation from APT that enables broadcasters to use inexpensive IP links and still maintain professional broadcast-grade audio quality and reliability.It delivers the audio quality and reliability you expect from a T1/E1 link at a fraction of the associated cost. APT SureStream Technology also offers the added benefit of « Always-On Redundancy ». With APT SureStream technology, you can save thousands on your audio transport bills and still offer your listeners the highest quality sound.

SureStream logo

AoIP Distribution

APT codecs offer the reliability, quality, and redundancy required by broadcasters for applications such as Studio-Transmitter links, studio networking and remote broadcasting/OBs. With both stereo and multi-channel audio platforms available, APT units can be deployed as a simple STL, a large-scale broadcast audio network or an audio distribution installation for commentary or in-store music.


Remote studio codecs

Studio to transmitter link (STL)

Secure IP transport

AoIP distribution

Dante Compatible

APT Dante Module

For Modular Codec Frame

The APT Dante Network Interface enables you to connect your APT Multi-channel AoIP Codec directly to a Dante or AES67 network.

This enables the codec to become fully integrated into your in-house network ecosystem, ensuring interoperability with near-zero latency and synchronization.

With the Dante interface fitted, your AoIP multichannel codec becomes the gateway from your local Dante domain to any network destination over external networks.

APT Dante Module

Advanced Communication Solutions

The APT MultiChannel Codec is accompanied with a range of monitoring, 
management, and control solutions. It comes with a Graphic User Interface and  is compatible with ScriptEasy and KYBIO Media.

Graphic interface APT Multichannel codec

Graphic user interface


Advanced telemetry

Kybio NMS

KYBIO cloud-based monitoring included with your product (1-year SaaS subscription free of charge).

Activate Kybio on your product


See Brochure For Technical Specifications


Customer Stories



"The use of Digital MPX is helping Rice University make significant savings by reducing the manpower required to maintain the plant."

- Rob Meuser, CTO -
Engineaux Inc, USA 




Digital MPX schema New Zealand

How it's done in New Zealand

With contribution of Markkus Bekker of Southern Broadcast Ltd.

We'd love to hear about your project

Contact us for any of your inquiries. Our Sales team is here to assist you with projects, questions on our products, or to find a local distributor.

FOR TECHNICAL SUPPORT, please go to the support page to submit your request. The below form is for new inquiries only.