4-Channel 2 Display with Shift Page Digital Speaker Station

Speaker Station

  • Easy to use front panel with OLED displays & backlit keys
  • Headset or hands free support with speaker and mic
  • 2 Keysets assignable to channels
  • Shift page for 4-channel operation
  • Program Audio level control
  • Display swivels for optimal viewing angles


  • Ethernet Network port with PoE*
  • Powerline terminal plug to HMS-4X**


  • 4-gang for flush mounting
  • Optional S-MOUNT for desktop use

The 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 connections is not available for Arcadia. Contact Clear-Com for further information.

Item Part Number:



(4) 6-32 x 1/2″ mounting screws (280038Z)
(4) Screw cover (416G054)
(1) Terminal block connector for powerline (210085Z)
(1) Terminal block connector for DC power (210369Z)

Optional Accessories (sold separately):
Wall adapter PSU 15W 48V DC (453G025)
Inline PSU 15W 48V DC (453G026)

The HelixNet HKB-2X speaker station is a 4-gang flush-mountable user station with four channels over two shift pages hosted by the 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.


Powerline**: Powerline, Terminal Block 5 pole, 5mm pitch
Ethernet/PoE *: RJ45
Headset: 4-pin XLR–M or 7-pin XLR-M with (2) PTT GPI (-X7)
Gooseneck Mic: 3-pin Tuchel
Power Connector: Terminal Block 2 Pole, 5mm

Microphone Pre-amplifier

Headset Mic Impedance: 200Ω (Dynamic)
Headset Mic Voltage: 1.7V (Electret selectable)
Limiter: +23dB
Route to four-wire output at 0dBu out:
Mic Gain: 60dB (Dynamic), 45dB (Electret)
Frequency Response: 300Hz – 10 kHz ± 3dB, contoured for intelligibility
Distortion: <0.1% THD @ 1kHz
Noise: <-65dBu
Headphone Limiter: 0dB (selectable)

Headphone Amplifier

Load Impedance: >32Ω
Output Level: +12dBu before clipping
Sidetone: -12dB (selectable)
Route from a four-wire input at 0dBu in:
Max Gain: 0dB
Frequency Response: 40Hz – 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

Logic Inputs – PTT/GPI (-X7 only)

Assignable to talk, call, mic and headset keys
Input: 2
Style: Powered input, close contact to ground
Detection Voltage (Min): 3V
Input Voltage (Max): 5V
Output Voltage: 5V
Output Current (Max): 1mA

Device Power

Voltage: 48V DC
Current (Max): 0.3A
Power (Max): 14.4W
BTU (Max): 49BTU/hr
Input Power Connector: Terminal Block 2 Pole, 5mm

This unit can be powered via:

AC Adapter – Wall (not included)

Input Voltage Range: 100 – 240V AC
Input Frequency Range: 50 – 60Hz
Input Power Connector: Universal
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:
HKB (Local Power) = 1 beltpack
HKB (Speaker Off) = 2 beltpacks
HKB (Speaker On) = 3 beltpacks
Note the maximum Powerline capacity of the HMS-4X.

Use HelixNet Cable Calculator to validate load and cable distance.


32º – +113ºF (0 – +45ºC)
90% relative humidity


4-Gang NEMA, 4.5 x 8.2 x 2.4in (HxWxD)
(114 x 209 x 61mm)


18.8oz (0.53kg)

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, Linking
Optional for device names and linking

Network Parameters

HMS-4X Endpoint Resource Use: 1
300 (max) kbps from each HKB to HMS
1200 (max) kbps from HMS to HKB
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

Please refer to the Clear-Com HelixNet Network Guide for additional switch settings and network characteristics.
*Ethernet to HMS-4X requires HLI-ET2
**Not available for Arcadia. Contact Clear-Com

Associated Products

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