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HLI-4W2 (Last Time Buy)

The HelixNet HLI-4W2 is a dual 4-wire interface module for the HMS-4X main station. The HelixNet IP networking guide provides specifications, best practices and guidance for the integration of HelixNet into an existing or new IP network.



  • 4-wire interface for HMS-4X(2)
  • Transformer isolated
  • Level and VOX control
  • Clear-Com call signal

The HelixNet System 

  • Wired Partyline - Networked
  • Flexible cabling
  • Up to 24 Channels – Licensed
  • Program Audio user level control

Effortless Management 

  • Fast front panel control and configuration
  • Easy to use CCM browser configuration
  • Plug-and-go with auto discovery
  • Central upgrades from main station

Item Code




4-wire: (2) EtherCON RJ45

4-wire Option Module Inputs

Maximum Level Before Clipping: 18dBu

Nominal Input Level: 0dBu (selectable)

Input Impedance: >= 10KO

Route to 4-wire output at 0dBu in: Frequency Response: 20Hz - 10kHz ±3dB

Distortion: <0.2% THD @ 1kHz

Noise: <-65dBu

4-wire Option Module Outputs

Maximum Level Before Clipping: 18dBu

Nominal Output Level: 0dBu (selectable)

Output Impedance: <= 100O

Route to 4-wire input at 0dBu in: Frequency Response: 300Hz - 12kHz ±3dB

Distortion: <0.1% THD @ 1kHz

Noise: <-55dBu


2.2 x 7.4 x 1.5in (HxWxD)

(57 x 187 x 39mm)


13oz (0.38kg)

Network Specifications (Firmware Version 4.2+)
Network Protocols

Ethernet IPv4–Unicast Audio and Control

mDNS–Multicast Device Discovery

Layer 3 routable with mDNS function limitations

HTTP–Management RTP–Audio Transport

WavPack–Audio Codec

Network Ports


Port 80 TCP–System Management

Port 6001 TCP–System Management

Port 6001 UDP–Audio Streams


Port 5353 UDP–mDNS, Names, Discovery

Network Parameters

HMS-4X Endpoint Resource Use: 1 per active port

Bandwidth: 300 (max) kbps from each active port to HMS 1200 (max) kbps from HMS to each active port

Network Jitter Tolerance: <= 128ms jitter buffer per audio stream receiver automatically adjusted to network performance

QoS Tags: DSCP=41, Assured Forwarding (AF)

System Reserved IP Range: for endpoints


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