4-Wire Interface Module


  • 4-wire interface for HMS-4X
  • 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 Part Number:


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.

Technical Specifications


4-wire: (2) EtherCON RJ45

4-wire Option Module Inputs

Maximum Level Before Clipping: 18dBu
Nominal Input Level: 0dBu (selectable)
Input Impedance: >= 10KΩ

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: <= 100Ω
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
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
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

Associated Products

WordPress Lightbox Plugin