Lab Gruppen C 5:4X

SKU: Lab Gruppen C 5:4X
$ 1,899.99

The C 5:4X is one of four C…X models in the C Series, each uniquely suited for a range of installed applications with relatively lower power output requirements. C…X models share most features of the original (higher power) C Series models, and they share the same compact, lightweight 2U chassis. However, the C…X models are offered in both four- and eight-channel versions, offering even greater channel density and installation flexibility. Also, because the unique benefits of Class TD® are more applicable at higher power levels, the C…X models employ a cost-efficient proprietary Class D output design. Other features unique to C…X models include a universal power supply, selectable 35 Hz high-pass filter, and built-in GPIO control facilities.


This amplifier is uniquely capable of adapting to a wide variety of demanding load conditions. Each channel has an individually configurable Voltage Peak Limiter (VPL™), which allows the output to be optimized for any loudspeaker load – whether a single large subwoofer or a series of small 70 V loudspeakers (100 V in bridge mode). VPL works in combination with adjustable input gain (adjustable in 2-channel blocks) to achieve maximum headroom regardless of input levels or output impedances. Additionally a 35 Hz high pass filter may be inserted in each 2-channel section.


Every C Series amplifier is ready for the NomadLink® network right out of the box. With NomadLink, key amplifier parameters are displayed via DeviceControl software, and remote control of channel mutes and power on/off is under network control.


GPIO facilities – provided exclusively on C…X models – allow access to key amplifier functions such as power on/off and fault reporting.

Number of amplifier channels 4
Peak total output all channels driven 500 W
Peak output voltage per channel 100 V
Max output current per channel 5.6 Arms
Max output power (all channels driven)
16 ohms 125 W
8 ohms 125 W
4 ohms 125 W
2 ohms 60 W
Hi-Z per ch. (all ch.’s driven): 70 Vrms / 100 V peak 125 W
Max output power bridged
16 ohms 250 W
8 ohms 250 W
4 ohms 125 W
2 ohms Not recommended 1
Bridged per ch.: 140 Vrms / 200 V peak 250 W
THD 20 Hz - 20 kHz at 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 6.8 Hz - 34 kHz
Input impedance 20 kOhm
Common Mode Rejection (CMR) >50 dB, 20 Hz - 20 kHz
Output impedance @ 100 Hz 48 mOhm
Gain, Sensitivity and Limiters
VPL, selectable per ch 2 100, 63, 45, 32 V
VPL, when bridged 2 3 200, 126, 90, 64 V
Voltage Peak Limiter mode (per ch.) Hard / Soft
Amplifier gain selectable (all channels) – rear-panel switches 3 29, 32, 35, 38 dB
Default gain 32 dB
Level adjustment (per channel) Front-panel potentiometer, 21 position detented from -inf to
Connectors and Buttons
Input connectors (per ch.) 3-pin Phoenix, electronically balanced
Output connectors (per ch.) Barrier strip 2-pole screw terminals
Output bridge mode A+B, C+D, E+F, G+H, inputs A, C, E, G 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 Individual switches on front panel
Cooling Two fans, front-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 user interface
Common NomadLink Network; Power Average Limiter (PAL)4; Power on
Per channel Signal present / High-impedance; Voltage Peak Limiter (VPL); Current Peak Limiter (CPL): Very High Frequency (VHF); High temperature; Fault; Mute
Operating voltage, 230 V / 115 V nominal Universal power supply 65-265 V
Minimum power-up voltage, 230 V / 115 V 80 V
Power Average Limiter (PAL) 4 Yes
Power Factor Correction (PFC) Yes
Soft-start / Inrush Current Draw Yes / max. 5 A
Mains connector IEC inlet
Dimensions 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
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