The APT IP CODEC (formerly known as WorldCast Horizon NextGen) offers the most complete set of IP features ever included in APT’s extensive range and features both our revolutionary “SureStream” technology and intelligent ScriptEasy scripting. In addition, this next generation IP audio codec also offers a wide range of algorithms as standard on a solid DSP platform with dual IP ports and redundant power supplies. Despite the high feature density, the APT IP CODEC is extremely competitively priced.

Perfect for STLs and mission-critical applications, the APT IP CODEC provides extensive control and monitoring capabilities to manage both your audio, data and network conditions and other equipment located at the transmitter site.


Audemat ScriptEasy Powerful Performance

  • High quality audio transport over IP networks using RTP/UDP
  • Multi-Algorithm Support as standard, including HE-AAC
  • Non-destructive, cascade-resilient, real-time coding with aptX® Enhanced
  • 192/128 kHz Sampling supports digital MPX over AES and fully digital transfer
  • Dual IP ports configurable for back up
  • Robust DSP-based platform for mission-critical operation
  • Support of Specific-Source Multicast (SSM)


Audemat ScriptEasy Powerful Control

  • NTP System Time option for program time-alignment on multiple Decoder sites
  • Highly intuitive Network Management Software (NMS)
  • Embedded web server for access & control from any location
  • Dual IP Ports, configurable for management and  redundant streaming
  • Distributed intelligence powered by ScriptEasy
  • VLAN aware interfaces for flexible network management
  • Allows management of network conditions such as packet size, buffers and QoS levels for optimum audio performance


Audemat ScriptEasy Powerful Savings

  • Competitively priced professional platform
  • SureStream for broadcast-grade reliability and audio quality over open internet links
  • Support for unicast, multiple unicast & multicast networking ensuring minimal and flexible operational costs.


  • Professional & Affordable IP Audio Codec
  • Dual IP Ports, configurable for management and redundant streaming
  • Multi-algorithm support as standard, including HE-AAC, aptX® Enhanced & linear
  • Audio Backup from SD card
  • 192/128kHz Sampling supports transmission of Digital MPX over AES*
  • Content Time Alignment for Multi-Frequency FM networks utilizing NTP
  • SureStream Technology enables broadcast-grade audio over inexpensive IP Links*
  • Distributed Intelligence powered by ScriptEasy
  • Forwarding of audio or non-audio UDP streams, such as PAD or HD Exporter Data
  • Auto-Detection of received audio format
  • Auxiliary data for transmission of RBDS / RDS or PAD
  • Network Security features with Firewall capability
  • 4 Opto-coupled Inputs and 4 Relay Outputs
  • Support for SNMP, Alarm & Event Logging
  • Reliable DSP-based architecture 
  • Intuitive Web Interface
* Cost option



Unit Status GUI

Unit Status GUI

Unit Performance GUI

Unit Performance GUI

Unit NMS View

Unit NMS view

ScriptEasy IDE

ScriptEasy IDE

Backup Example

Backup Example

SNMP Example

SNMP Example

SureStream for Broadcast Quality Audio over IP

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. 

 Learn more about

Advanced Telemetry & Remote Control with ScriptEasy

ScriptEasy is the revolutionary facility control software developed by WorldCast Systems to give users the power and flexibility to create “Smart” sites; ones that can automatically take action to correct any critical errors that affect operations.

Featuring an intuitive Graphic User Interface (GUI), ScriptEasy incorporates GPIO functions, serial communications, logic operators, live user inputs, timers and more. This allows the site operations to be “scripted”, to allow evaluation of multiple parameters and even automatically engage backup systems, while simultaneously alerting relevant technical personnel.

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Connect with WorldCast Manager

The WorldCast Manager  simplifies the management of all SNMP-enabled devices in a network, providing real-time status, historical data and visualization of multiple devices from a single screen. The intuitive and simple-to-use interface shows all devices located at your site(s) displaying product information, alerting you to any alarms and providing one-click access to the unit’s web-based control interface.

The WorldCast Manager is compatible with all WorldCast Systems’ equipment as well as SNMP devices from ANY manufacturer.

logo WorldCast Manager

Learn more about
WorldCast Manager


APT IP CODEC application

APT IP CODEC application Time aligned content playout with NTP timing
user report

User report

«The audio quality is exceptional, and the boxes stay up and running 24/7. Overall, the APT/WorldCast AoIP solutions are what they claim to be:  Audio quality, uptime, seamless IP transport using their SureStream technology are all on the money.»
Joe Curcio, WNYC, USA

user report

User report

“I would absolutely recommend the APT IP Codec as the new generation of audio codecs! I do not compromise on the quality I bring to the client and that is the reason I use the APT IP Codec with SureStream technology for my audio distribution. It works, it’s as simple as that!”

user report

User report

"Despite the poor quality of the internet connections available, the project was able to proceed with high quality audio, very workable latency and with connections that cost a fraction of what we would have spent on satellite."
John Pearce, Technology Manager, Nova Entertainment,  Sydney, Australia

user report

User report

"I would absolutely recommend the APT IP Codec as the new generation of audio codecs! I do not compromise on the quality I bring to the client and that is the reason I use the APT IP Codec with SureStream technology for my audio distribution. It works, it’s as simple as that!”

Oliver Schitz, Voice Talent, Germany


Current Version: 3.0

APT IP CODEC rear panel
EthernetDual physical Ethernet ports, RJ45 for management and streaming
Virtual NetworkVirtual Interfaces and VLAN tagging
Analog I/OElectronically balanced, capacitive isolated XLR  for Left/Right, Imp. Hi/Lo and 600 Ω
Digital Audio I/OAES-3, 24 Bit, transformer balanced, Imp. 110 Ω,  XLR-Connectors
Digital Ref InputAES, transformer balanced, 110 Ω, XLR
Serial Aux Data9 pin D Type, RS232 level
GPIO15 pin D-Type 
ManagementWeb GUI, APT NMS, SNMP, XML API (available with a later release)
Asymmetric  AudioIndependent audio modes for sent and receive, Tx and Rx clock domains
Digital Operation

Output FS, 32/44.1/48/96/192* kHz – software configurable

Audio Bandwidth10Hz to 20kHz mono & stereo 88kHz for digital MPX over AES (option)
Standard Coding AlgorithmsaptX Enhanced 16 & 24 Bit, Linear PCM 16 & 24 Bit 
MPEG 1/2 Layer II, MPEG4: AAC-LC/LD/ELD, MPEG2/4: HE-AAC v1/v2
Coding Delaymin. 2ms on aptX Enhanced and higher depending on chosen algorithm
Dynamic Range16 Bit  >85dB,  24 Bit  >120dB
Network and IP
IP Protocols SupportedRTP/UDP/IP, RTCP, DNS, Dynamic DNS, DHCP, ICMP, IGMP, VLAN, UPnP (IGD), NTP, SNMP, SMTP, HTTPS (management)
IP StatisticsComplete IP Statistics for each stream 
Casting ModesUnicast, multiple unicast, multicast, multi- multicast
De-Jitter BufferBuffer size 1 - 5,000ms adjustable, automatic packets re-sequencer 
RTP/UPD Streaming and ModesStereo audio multiple Tx-Streams, UDP stream forwarding, Auto-Detection of received Stream, Auto-Reply to sender
Quality of ServiceDiffServ, with separate DSCP values per stream, SureStream Technology* and Error Concealment
Backup FeaturesSD Card for audio file storage and system backup
Network SecurityService Filter and Firewall Features
Serial Data Rates (embedded)1200, 2400, 4800, 9600 Baud
Serial Data Rates via IP1200 - 115,200 Baud (8 rates)
AUX Data via UDPUDP forwarding PAD or private Data
GPIO4 switch inputs, 4 relays; GPI transmitted as separate UDP stream or embedded in aptX Enhanced
Physical specification
19” rack mount 1U Dimensions (W / L / H)44mm x 482mm x 160mm
Weight< 1,5 kg - 3.355 lbs
Main Power Supply100-250 V / 50-60 Hz
Power Consumption< 20W
Guaranteed Working Temperatures0°C - +55°C
HumidityUp to 95% relative humidity (non-condensing)

Order information

Software Options
CD00123SureStream - APT IP CODEC
L00074Digital MPX Over IP option for APT IP CODEC
Hardware Options


How to

  • How to set up a SureStream link on the bench


  • Watch the Webinar: How to Create your ULTIMATE IP Audio Network




    Published on Sep 20, 2017
  • APT SureStream technology

    Published on Feb 15, 2017
  • AUDEMAT ScriptEasy

    Published on May 30, 2017

Quick Start Guides

  • APT IP CODEC - Quick start

    Published on Jul 22, 2016


  • APT IP CODEC - Manual

    Published on May 25, 2018
  • ScriptEasy - Manual

    Published on Mar 22, 2018


  • Main/Backup Switching of AES/EBU Signals Script

    Published on Oct 30, 2017
  • WorldNet NMS Software

    Published on Nov 5, 2018


  • WorldCast Systems Overview

    Published on Nov 15, 2018
  • The Essential Guide To Audio Over IP for Broadcasters

    Published on Feb 22, 2018

Press Kit

  • WorldCast Systems Logo - Press Kit

    Published on Feb 16, 2017
  • APT IP CODEC - Press Kit

    Published on Feb 16, 2017