4-Channel 1RU Digital Remote Station

Remote Station

  • Easy to use front panel with OLED displays & backlit keys
  • Headset or hands-free support with speaker and mic
  • 4 Keysets assignable to channels
  • All Talk, Stage Announce, RMK & Program Audio level control
  • Expansion mode for 8-24 channels


  • Ethernet Network port with PoE*
  • Powerline loop-through on XLR***
  • Program Audio input
  • Stage Announce output
  • Contact closure input & output

HelixNet System

  • Wired Partyline – Networked
  • Hosted by Arcadia or HMS-4X
  • Up to 24 Channels – Licensed
  • Up to 64 HelixNet Endpoints
  • Program Audio user level control

Effortless Management 

  • Easy to use CCM browser configuration
  • Fast front panel control & configuration
  • Central discovery & pairing on Arcadia
  • Plug-and-go Powerline to HMS-4X
  • Central firmware upgrades from host

*CCM and Endpoint network connection to HMS-4X requires HLI-ET2
***XLR Powerline connection is not available for Arcadia. Contact Clear-Com for further information.

Item Part Number:

HRM-4X (includes):
(1) Inline PSU 15W 48V DC (453G026)

The HelixNet HRM-4X remote station is a 1RU 4-channel intercom user station with utility connections for Program Audio input and Stage Announce output, hosted by Arcadia® Central Station or HelixNet HMS-4X main station.

Note: Access the HelixNet Cabling Calculator to calculate estimated maximum cable length for a single Clear-Com HelixNet digital partyline connection.

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

HelixNet System Hosts

Arcadia: Supports up to 64 HelixNet endpoints (HRM-4X, HKB-2X & HXII-BP) over Ethernet. Up to 24 Channels can be HelixNet Enabled using a Licensed Port for assignment to any HelixNet endpoints keyset.
HMS-4X: Supports up to 64 endpoints (HRM-4X, HKB-2X, HBP-2X, HXII-BP, HLI-2W2, HLI-4W2, LQ port). User stations can connect via HMS’s 2 Powerlines (see datasheet for limits) or over Ethernet via optional HLI-ET2 module. HMS allows use of 12 channels which can be expanded to 24 using optional license.


XLR Powerline**: 3-pin XLR-M/F
Ethernet/PoE*: EtherCON RJ45
Headset: 4-pin XLR–M
Gooseneck Mic: 3-pin Tuchel
Program Audio: 3-pin XLR–F
Stage Announce: 3-pin XLR–M
Hot Mic/IFB Interface: 1/4″ (0.64 cm) TRS jack
GPIO: 9-pin D-type male (1xGPI, 1xGPO)
USB: Type A
DC Power: 3-pin KPJX-PM-3-S

Microphone Pre-amplifier

Headset Mic Impedance: 200Ω (Dynamic)
Headset Mic Voltage: 1.7V (Electret selectable)
Limiter: +23dB
Route to 4-wire output at 0dBu out:
Mic Gain: 60dB (Dynamic), 45dB (Electret)
Frequency Response: 300Hz – 10 kHz ±3dB, contoured for intelligibility
Distortion: <0.2% THD @ 1kHz
Noise: <-55dBu (Dynamic),<-65dBu (Electret)

Headphone Amplifier

Load Impedance: >32Ω
Output Level: +12dBu before clipping
Sidetone: -12dB (selectable)
Route from a 4-wire input at 0dBu in:
Max Gain: 0dB
Frequency Response: 180Hz – 10kHz +3dB
Distortion: <0.1% THD @ 1kHz
Noise: <-65dBu
Headphone Limiter: 0dB (selectable)

Loudspeaker Amplifier

Load Impedance:
Output Level: +18dBu before clipping
Route from a 4-wire input at 0dBu in:
Max Gain: 18dB
Frequency Response: 200Hz – 10kHz ±3dB
Distortion: <0.1% THD @ 1kHz
Noise: <-50dBu

Program Audio Line Input

Arcadia System Host: Local Listen Only
HMS-4X System Host: Local or Channel Assignable.

Maximum Level Before Clipping: +18dBu
Nominal Input Level: 0dBu (selectable)
Input Impedance: >= 10KΩ
Route to 4-wire output at 0dBu out:
Frequency Response: 20Hz – 10kHz ±3dB
Distortion: <0.2% THD @ 1kHz
Noise: <-65dBu

Stage Announce Output

Arcadia System Host: Local SA Only
HMS-4X System Host: Local SA or Channel Assignable.

Maximum Level Before Clipping: 18dBu
Nominal Output Level: 0dBu (selectable)
Output Impedance: <= 100Ω
Route from a dynamic headset:
Frequency Response: 300Hz – 12kHz ±3dB
Distortion: <0.1% THD @ 1kHz
Noise: <-55dBu

Hot Mic Output

Maximum Level Before Clipping: +12dBu
Nominal Output Level: 0dBu (selectable)
Output Impedance: <= 100Ω
Route from a dynamic headset:
Frequency Response: 300Hz – 12kHz ±3dB
Distortion: <0.2% THD @ 1kHz
Noise: <-55dBu

Logic Inputs -GPI

Assignable to talk, call, mic and headset keys
Input: 1
Style: Powered input, close contact to ground
Detection Voltage (Min): 3V
Input Voltage (Max): 5V
Output Voltage: 5V
Output Current (Max): 1mA

Logic Outputs – GPO/Relay

Assignable to talk, call, SA keys and channel events
Outputs: 1
Style: Power Relay
Normalized: Open or Closed, separate pins
Switching Voltage (Max): 30V
Switching Current (Max): 2A


Voltage: 48V DC
Current (Max): 0.3A
Power (Max): 14.4W
BTU (Max): 49BTU/hr
Input Power Connector: KPJX-PM-3-S

This unit can be powered via:

AC Adapter – Inline:
Input Voltage Range: 100 – 240V AC
Input Frequency Range: 50 – 60Hz
Input Power Connector: IEC-C14
Output Voltage: 48V DC
Output Power (Max): 15W
Output Power Connector: KPPX-3-P
PoE – Power over Ethernet*
IEEE 802.3af-2003 – Class 0
PSE: 15.4W DC max @ Power Source Req.
PD: 12.95W DC max @ Powered Device Draw
Input Voltage: ±29.5V DC
Input Current (Speaker Off): 0.3A
Input Current (Max): 0.5A
Powerline Utilization:
HRM (Local Power) = 1 beltpack
HRM (Speaker Off) = 2 beltpacks
HRM (Speaker On) = 3 beltpacks
Note the maximum Powerline capacity of the HMS-4X.
Use HelixNet Cable Calculator to validate load and cable distance.


32º – +104ºF (0 – +40ºC)
90% relative humidity


1RU, 1.75 x 19 x 6.4in (HxWxD)
(44 x 483 x 165mm)


4lbs (1.8kg)

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, Expansion
Port 6001 TCP–System Management
Port 6001 UDP–Audio Streams

Port 5353 UDP–mDNS, Names, Discovery, Linking, Expansion
Optional for device names and linking
Mandatory for HMS/HRM Expansion

Network Parameters

HMS-4X Endpoint Resource Use: 1-3
300-600 (max) kbps from HRM to HMS dependent on use of Program Audio Input
1200-2400 (max) kbps from HMS to HRM dependent on use of Stage Announce Output
Network Jitter Tolerance: <= 128ms jitter buffer per audio stream receiver automatically adjusted to network performance
QoS Tags: DSCP=41, Assured Forwarding (AF)
Link-Local Default IP Address Range:
System Reserved IP Range: for endpoints

Recommended Ethernet Switches

• Managed Ethernet Switch – Layer 3
• 100/1000 Base-T ports for endpoints
• 1000 Base IP Trunks between switches
• QoS Configuration
• Energy Efficient Ethernet bypass option
• IGMP Snooping bypass option

Associated Products

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