Lab Gruppen C 48:4 - 1200W 4-Channel at 4-Ohm 70V/100V Power Amplifier with Terminal Outputs and NomadLink Network Monitoring in Black Finish

The Lab Gruppen C 48:4 is a powerful, 4-channel amplifier designed for both installed and touring sound systems that require uncompromising sound quality and efficient performance. Building on the legacy of Lab Gruppen amplifiers, the C 48:4 combines advanced technology and superior sound to deliver clear, transparent audio with unmatched efficiency. At the heart of the amplifier is Lab Gruppen's patented Class TD technology, a proprietary form of tracking Class D that offers the efficiency of Class D amplifiers while maintaining the high-fidelity audio quality of Class A/B output stages. This combination ensures exceptional sound quality, even at high power outputs.

With a total output of up to 4,800 watts, the C 48:4 delivers 1,200 watts per channel at 4 ohms, making it a versatile solution for various applications ranging from large-scale PA systems to distributed 70V or 100V speaker setups. The amplifier features a Regulated Switch Mode Power Supply (R.SMPS), which ensures constant power output under fluctuating voltage conditions, contributing to the C 48:4's stability and efficiency. It also offers a Voltage Peak Limiter (VPL) for each channel, which can be configured to optimize performance for different types of speakers, ensuring the right output for both subwoofers and high-impedance systems.

The C 48:4 is built with Lab Gruppen's renowned cooling system, the Intercooler, which utilizes a network of small copper fins to efficiently dissipate heat. This system, combined with strategically placed output devices, ensures that the amplifier can operate at its peak power output for extended periods without overheating. For applications that require network control, the C 48:4 is equipped with NomadLink network monitoring, providing remote access to amplifier parameters such as channel mutes and power on/off functions. The amplifier is fully compatible with the NomadLink system, allowing for seamless integration into larger, networked audio systems with real-time monitoring through DeviceControl software.

The amplifier's compact 2U rackmount chassis allows for easy integration into space-constrained installations, while its intuitive front-panel controls and indicators provide clear feedback on amplifier status. The C 48:4 includes balanced 3-pin Phoenix audio inputs and secure 2-pole screw terminal outputs, offering a flexible solution for a variety of connections. With advanced protection features and reliable cooling, the C 48:4 is built to withstand demanding conditions while delivering consistent, high-quality performance in both live sound and permanent installations.

Features

• 4-channel amplifier with up to 1,200W output per channel
• Class TD technology combining Class D efficiency with Class A/B sound quality
• Regulated Switch Mode Power Supply (R.SMPS) for stable power output
• Individually configurable Voltage Peak Limiter (VPL) per channel for optimized performance
• NomadLink network support for remote monitoring and control via DeviceControl software
• Efficient Intercooler copper cooling system for sustained high-power output
• Compact 2U rackmount chassis for space-efficient installation
• Balanced analog audio inputs and secure 2-pole screw terminal outputs
• Intelligent fan system with temperature-controlled speed for efficient cooling
• Comprehensive protection features for current, voltage, temperature, and fault monitoring
• CE, ANSI/UL 60065, CSA C22.2 NO. 60065, and FCC approvals

Specifications

General

• Number of channels: 4
• Peak total output all channels driven: 4800 W
• Peak output voltage per channel: 141 V
• Max. output current per channel: 17.5 Arms

Maximum Output Power

• Per channel (all channels driven): 625 W @ 16 Ohm, 1000 W @ 8 Ohm, 1200 W @ 4 Ohm, 600 W @ 2 Ohm, 1100 W @ Hi-Z (70 Vrms / 100 V peak)
• Bridged per channel: 2000 W @ 16 Ohm, 2400 W @ 8 Ohm, 1200 W @ 4 Ohm, 1800 W @ Hi-Z (140 Vrms / 200 V peak)

Performance with Gain (35 dB and VPL: 100V)

• 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: 6.8 Hz - 34 kHz
• Input impedance: 20 kOhm
• Input Common Mode Rejection, CMR: >50 dB, 20 Hz to 20 kHz
• Output impedance @ 100 Hz: 30 mOhm

Voltage Peak Limiter (VPL), Maximum Peak Output

• VPL, selectable per channel: 141, 118, 100, 85, 71, 59, 50, 42 V
• VPL, when bridged: 282, 236, 200, 170, 142, 118, 100, 84 V
• Voltage Peak Limiter mode (per channel): Hard/Soft

Gain and Level

• Amplifier gain selectable (all channels): 23, 26, 29, 32, 35, 38, 41, 44 dB
• Default gain: 35 dB
• Level adjustment (per channel): Front-panel potentiometer, 21 position detented from -inf to 0 dB, hidden behind security panel/dust filter grille

Connectors and Switches

• Input connectors (per channel): 3-pin Phoenix, electronically balanced
• Output connectors (per channel): Barrier strip 2-pole screw terminals
• Output bridge mode: A+B and/or C+D, inputs A and C are input source
• NomadLink network: On board, 2 x RJ45 connectors
• 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

Front-Panel Indicators

• Common: NomadLink Network; Power Average Limiter (PAL); Power on
• Per channel: Signal present / High-impedance; -10 dB and -4 dB output signal; Voltage Peak Limiter (VPL); Current Peak Limiter (CPL); Very High Frequency (VHF); High Temperature; Fault; Mute

Power

• Operating voltage, 230V / 115V nominal: 130-265V / 65-135V
• Minimum power-up voltage, 230V/115V: 171V / 85V
• Power Average Limiter (PAL): Yes
• Power Factor Correction (PFC): No
• Soft start / Inrush Current Draw: Yes/max. 5 A
• Mains connector: 230V CE: 16 A, CEE7; 115V ETL: 20A/NEMA 5-20P

Physical

• Dimensions (WHD): 19 x 3.46 x 13.5 inches
• Weight: 26.4 lbs
• Finish: Black painted steel chassis with gray painted steel front
• Approvals: CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC