Lab Gruppen C 68:4 - 1700W 4-Channel at 4-Ohm 70V/100V Power Amplifier with Terminal Outputs and NomadLink Network Monitoring in Black Finish

The Lab Gruppen C 68:4 is a high-performance, 4-channel power amplifier designed to provide uncompromising sound quality for both installed and touring applications. Known for its superior sound clarity and transparency, the C 68:4 has earned recognition among top FOH engineers and sound rental companies around the world. The amplifier integrates Lab Gruppen's proprietary Class TD technology, a tracking Class D implementation that offers the efficiency of Class D amplifiers while preserving the sonic excellence typically associated with Class A/B output stages. This unique combination ensures a tight and transparent sound that meets the highest industry standards.

At the core of the C 68:4's performance is a Regulated Switch Mode Power Supply (R.SMPS), which contributes to its remarkable efficiency and stable operation, even with significant fluctuations in mains voltage. Coupled with Class TD technology, the R.SMPS helps the amplifier achieve extraordinary power density. This allows the C 68:4 to provide more channels and more power in a compact and space-efficient design. The amplifier offers 1,700 watts per channel at 4 ohms, making it ideal for powerful PA systems, subwoofers, and 70V/100V speaker installations. Each channel is equipped with a Voltage Peak Limiter (VPL), which can be adjusted to match various loudspeaker loads, ensuring maximum performance while preserving the integrity of the sound.

Designed with high power density in mind, the C 68:4 uses Lab Gruppen's advanced Intercooler copper cooling system to efficiently dissipate heat. The cooling system features thousands of small copper fins that effectively spread heat, while the output devices are strategically arranged for uniform airflow and optimal cooling. The amplifier also boasts comprehensive protection features to ensure reliability and minimize service interruptions. These features provide real-time warnings for issues such as faulty wiring, extreme ambient temperatures, and improper usage, and they activate protection measures only when dangerous thresholds are crossed.

The C 68:4 is fully equipped with NomadLink network monitoring, providing real-time remote control of amplifier parameters via the intuitive DeviceControl software. With NomadLink, users can monitor and adjust key settings, such as channel mutes and power on/off functions, from anywhere within the network. This makes the C 68:4 ideal for large, complex installations where centralized control is essential. The amplifier's robust design, with balanced 3-pin Phoenix connectors for inputs and 2-pole screw terminal outputs, ensures reliable connections for a variety of system configurations. Its 2U rackmount chassis is compact and durable, saving valuable space while maintaining reliability and performance.

Features

• 4-channel amplifier with up to 1,700W output per channel
• Class TD technology delivering Class A/B audio quality with Class D efficiency
• Regulated Switch Mode Power Supply (R.SMPS) for stable power output under fluctuating conditions
• Individually configurable Voltage Peak Limiter (VPL) per channel for optimal performance with various loudspeakers
• NomadLink network support for remote monitoring and control via DeviceControl software
• Efficient Intercooler copper cooling system for enhanced heat dissipation and extended peak output
• Compact 2U rackmount chassis for space-efficient installation in rackmount systems
• Balanced analog audio inputs on 3-pin Phoenix connectors and secure 2-pole screw terminal outputs
• Intelligent fan system with temperature-controlled speed for efficient cooling
• Comprehensive protection features, including 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: 6800 W
• Peak output voltage per channel: 141 V
• Max. output current per channel: 24.5 Arms

Maximum Output Power

• Per channel (all channels driven): 625 W @ 16 Ohm, 1200 W @ 8 Ohm, 1700 W @ 4 Ohm, 600 W @ 2 Ohm, 1600 W @ Hi-Z (70 Vrms / 100 V peak)
• Bridged per channel: 2400 W @ 16 Ohm, 3400 W @ 8 Ohm, 2400 W @ 4 Ohm, 3200 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
• 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