LAB GRUPPEN C 5:4X เพาเวอร์แอมป์ High continuous output power of 125 W per channel  at 70 V, 4 ohms, 8 ohms, and 16 ohms เครื่องขยายเสียง 

• Four channels in 2U - High channel density reduces space 

requirements and installation time

• High continuous output power of 125 W per channel 

at 70 V, 4 ohms, 8 ohms, and 16 ohms*

• All channels individually selectable for lo-Z or hi-Z 

Loudspeakers (2 ohm – 16 ohm) and distributed systems can be 

connected to the same unit

• Bridged operation – Channel pairs bridgeable for increased 

output or for driving 100 V systems 

• Patented output stage based on Class D topology

• High efficiency for lower thermal stress

• General Purpose Input/Output (GPIO) – Compatible with 

third-party control systems

• NomadLink® network ready

• Universal Power Factor Corrected PSU with IEC inlet 

• Efficient cooling – Dual variable speed, intelligent fans and 

parallel airflow over output devices provide uniform cooling

• Comprehensive circuit protection and fault indication

• Phoenix-style input connectors and barrier strip output 

connectors

An Installation Amplifier without Compromise

Lab.gruppen amplifiers have earned an enviable worldwide reputation for sonic excellence and rock-solid durability in touring sound applications. These same qualities are now available for a broad range 

of installed sound applications in the C 5:4X amplifier. By offering an 

unmatched combination of channel density, operating efficiency and 

configuration flexibility, the C 5:4X presents convincing performance 

and cost-saving advantages. Applications include primary systems 

for theme parks, shopping malls, airports, hotels and restaurants as 

well as auxiliary systems for performance venues, houses of worship 

and numerous other installed sound applications.

To achieve higher channel density without compromising performance, Lab.gruppen engineers developed a new output stage 

design. Based on a patented Class D circuit topology, these output 

stages produce sustained high power levels with very low distortion 

while maintaining efficiency levels of near 90%. A new universal 

switching power supply employs Power Factor Correction (PFC) 

to stabilize current draw, and it accepts any mains voltage from 

100 – 240 V (+/- 10%) @ 50 Hz or 60 Hz through the appropriate 

IEC cord.

The C 5:4X includes include unique features which enable each unit 

– or even each channel – to be configured for a specific application 

or load condition. Input gain is selectable in two-channel groups, and 

a 35 Hz high pass filter may be inserted. All channels are bridgeable 

in pairs, and Lab.gruppen’s exclusive Voltage Peak Limiter (VPL) feature allows each channel to be individually optimized for the reactive 

characteristics of the connected load. 

For comprehensive remote monitoring and control, the C 5:4X 

includes NomadLink® network ports for connecting to an optional 

NLB 60E NomadLink® Bridge & Network Controller and an Ethernetlinked PC. With NomadLink®, key amplifier parameters are displayed 

via DeviceControl software, and remote control of channel mute 

and power on/off is under network control. Alternatively, the GPIO 

facilities allow access to key amplifier functions via third-party 

remote control systems.

To ensure a long and trouble-free service life, the C 5:4X incorporates 

extensive features to safeguard internal circuits and connected loads. 

Protection and warning circuits prevent damage or service interruptions due to excessive current, DC at output, over-temperature, 

non-musical VHF (very high frequencies), and open load conditions. 

In addition, soft-start and PSU current limiting protect the mains 

supply from interruptions due to tripped circuit breakers or blown 

mains fuses.

Specifications C 5:4X

General

Number of channels 4

Peak total output all channels driven 500 W

Peak output voltage per channel 100 V / 70 Vrms

Max. output current per channel 5.6 Arms

Max. Output Power 16 ohms 8 ohms 4 ohms 2 ohms Hi-Z

Per ch. (all ch.’s driven) 125 W 125 W 125 W 60 W 125 W (70 Vrms / 100 V peak)

Bridged per ch. 250 W 250 W 125 W n.r. 250 W (140 Vrms / 200 V peak)

Performance with Gain: 32 dB and VPL: 100 V

THD 20 Hz - 20 kHz for 1 W <0.1%

THD at 1 kHz and 1 dB below clipping <0.05%

Signal To Noise Ratio >112 dBA

Channel separation (Crosstalk) at 1 kHz >70 dB

Frequency response (1 W into 8 ohms) +0/-3 dB 2.3 Hz - 56 kHz

Input impedance 20 kOhm

Input Common Mode Rejection, CMR 50 dB

Output impedance @ 100 Hz 48 mOhm

Voltage Peak Limiter (VPL), max. peak output

VPL, selectable per ch. 3) 100, 63, 45, 32 V

VPL, selectable when bridged 3) 1) 200, 126, 90, 64 V

Voltage Peak Limiter mode (per ch.) Hard / Soft

Gain and Level

Amplifier gain selectable (all channels) 1)

– rear-panel switches 29, 32, 35, 38 dB

Default gain 32 dB

Level adjustment (per ch.) Front-panel potentiometer, 21 position detented from -inf to 0 dB, hidden behind security panel/dust filter grille

Connectors and switches

Input connectors (per ch.) 3-pin Phoenix, electronically balanced

Output connectors (per ch.) Barrier strip 2-pole screw terminals

Output bridge mode A+B and/or C+D, inputs A and C are signal source

High pass filter Fixed at 35 Hz, switchable per channel

NomadLink® network On board, 2 x RJ45 connectors, IN and OUT

Intelligent fans (on/off) Yes, depending on presence of output signal

Power on/off and Remote enable on/off Individual switches on front-panel

Cooling Two fans, front-to-rear airflow, temperature controlled speed

General Purpose Outputs (GPO) Contact Closure types, 2-pole Phoenix

General Purpose Inputs (GPI) Contact Closure types, 2-pole Phoenix

Front-panel indicators

Common NomadLink® Network; Power Average Limiter (PAL) 2); Power on 

Per channel Signal present / High-impedance; Voltage Peak Limiter (VPL); Current Peak Limiter (CPL): 

Very High Frequency (VHF); High temperature; Fault; Mute

Power

Operating voltage, 230 V / 115 V nominal 100-240 V

Minimum power-up voltage, 230 V / 115 V 80 V

Power Average Limiter (PAL) 2) Yes

Soft start / Inrush current draw Yes / max. 5 A

Mains connector IEC Inlet / NEMA 5-15P

Dimensions (W/H/D) W: 483 mm (19”), H: 88 mm (2 U), D: 343 mm (13.5”)

Weight 8.5 kg (18.75 lbs.)

Finish Black painted steel chassis with gray painted steel front

Approvals CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC