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2wcom Systems GmbH

IP-4c STL Edition - Audio over IP Distribution Codec

IP-4c STL Edition - Audio over IP Distribution Codec

Regular price $2,673.00 USD
Regular price Sale price $2,673.00 USD
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Audio Channels
  • Multi-format 4-channel audio encoder/decoder 
  • Off-the-shelf option package with full-featured SIP/SAP interoperability 
  • Up to 4 digital or 2 analog stereo inputs and outputs 

Off-the-shelf option package: Benefit from short lead times and a cost-efficient ready-to-go configuration for your use-case! 

The IP-4c STL Editon is an audio codec for mission-critical studio-to- transmitter links (STL). The included feature-set perfectly meets the requirements for most distribution links while dual power supplies, network redundancy, RIST/SRT support and backup audio provide highest reliability for 24/7 operation. 

The IP-4c STL Editon can be equipped with up to 4 channels including the most relevant audio coding formats. The option package includes the Live Listening feature for monitoring of the audio sources and outputs directly over the web interface. 

Smart management: Configuration set-up via an easy to use web interface for general settings as well as for backup or fall back. For remote control, the codec offers various possibilities – HTTP, FTP, Telnet, NMS, SNMP. Perfect synchronization can be achieved by PTPv2 and latency control. 

Multi-format audio coding: Another advantage is the variety of possible algorithms like MPEG1 Layer 2, MPEG2 Layer 3, most AAC profiles including the new xHE-AAC and AAC-ELDv2, OPUS, Ogg Vorbis, PCM and Enhanced aptX. 

If additional functionality is required, please request a quote for the standard IP-4c Audio over IP Codec. It can which can be flexibly equipped with additional software and hardware components to fulfil more advanced requirements. 


Audio coding – fitting to your needs 

High quality multi-format audio de-/encoding 

  • MPEG 1/2 Layer 2, 3 
  • G.711, G.722, Linear PCM 
  • Opus 
  • Ogg Vorbis 
  • MPEG 2/4 AAC LC 
  • MPEG 4 HE-AAC v1&v2 
  • Extended HE-AAC (xHE-AAC) 
  • Enhanced aptX (E-aptX) 

IP streaming (unicast, multiple unicast & multicast) 

  • Rock solid network connection even in stress conditions according to standards RFC 3550, RFC 3551, RFC 3640, RFC 2250 
  • Professional audio IP streaming using UDP and RTP 
  • PRO MPEG FEC, Dual streaming 
  • SRT Secure Reliable Transport 
  • RIST Reliable Internet Stream Transport 

Backup / advanced redundancy management 

  • Flexible automatic switch over concept with free definition of alternative input sources as redundancy solution in case of failures 
  • Playing files from internal storage or using alternative streams (Icecast / Shoutcast) 
  • Dual IP ports for data + 1 IP port for control interface 


  • Remote control with various possibilities: HTTP/S, FTP, Telnet, NMS, SNMP, 
  • Revised configuration via web user interface for easier setup 
  • Insertion of localized advertisement 
  • SNMP v2c, relays, inputs 
  • Ember+ 


  • Energy efficient 24/7 broadcast quality 
  • RDS decoding (built in RDS / UECP decoder) 
  • Embedded auxiliary data (RBDS / RDS or PAD) and GPIO forwarding 


  • IP and MPEG parameters via SNMP v2c and relay 
  • Headphone output 
  • Icecast Live Listening 

Advanced control functionalities 

  • HTTP/HTTPS: via web interface 
  • NMS: Control via centralized 
  • Network Management System 

Perfect audio quality 

Balanced analogue and digital AES/EBU (integrated XLR connector) 


Advanced IP robustness functionalities 

Even to operate in standard IP networks 


Management of packet size, buffer and QoS 

Optional: Stream4Sure – 2wcom streaming technology with different codes / qualities and seamless switching of up to 4 streams 


Perfect audio & latency management 

Optional: GPS based 2wcom latency control solution usage in SFN FM networks 

Optional: ACIP compliant high audio quality and extremely low latency (PTPv2 network synchronization) 


Highly sophisticated monitoring and alarm concept 

Adjustable silence detection 

IP buffer and jitter check 

PLL control 

SNMP, alarm, source switch & event logging 

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