Clear-com HKB-2X Speaker Station

Clear-com HKB-2X

Clear-com HKB-2X Flush mount Speaker Station

Product Code: HKB-2X
Clear-Com HKB-2X

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• Gooseneck microphone connector with VOX circuitry
• Talk/Listen from headset mic, telephone handset or push-to-talk microphone
• Four modes of operation that are internally programmable via dip switches

Clear-com HKB-2X Flush mount Speaker Station

Clear-com 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.

User Station

This innovative front panel user station provides two keysets assignable to any intercom channel to each of the two pages, which the user can toggle between for a total of four channels. The station’s displays can be swiveled for optimal viewing angle. The user station is provided with a headset connection, gooseneck mic connector, loudspeaker and Program Audio level controls.

HKB-2X can be mounted in a standard 4-gang electrical enclosure or the optional S-MOUNT multipurpose enclosure for portable and desktop applications. The HKB-2X-X7 has seven-pin headset connection with additional PTT GPI, assignable to user station keys.

Speaker Station

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


• Ethernet Network port with PoE(1)
• Powerline terminal plug to HMS-4X(2/3)


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

The HelixNet System

• Wired Partyline - Networked
• Hosted by Arcadia or HMS-4X(3)
• 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(2/3)
• Central firmware upgrades from host


(1)CCM and Endpoint network connection to HMS-4X requires HLI-ET2
(2)XLR Powerline connections is not available for Arcadia. Contact Clear-Com for further information.
(3)HMS-4X is a legacy product as of 2022

HelixNet System Hosts

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.

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.

• Connectors

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: 200O (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: >32O

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: 8O

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

Powerline**: 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.

• Environmental

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

• Dimensions

4-Gang NEMA, 4.5 x 8.2 x 2.4in (HxWxD)

(114 x 209 x 61mm)

• Weight

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

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

Multicast: Port 5353 UDP – mDNS, Names, Discovery, Linking Optional for device names and linking

• Network Parameters

HMS-4X Endpoint Resource Use: 1

Bandwidth: 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

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