Lab Gruppen C 68:4 6800W 4-Channel Amplifier with NomadLink Network Monitoring - C684

Product Overview

The Lab Gruppen C 68:4 is a 6,800W 4-channel commercial installation amplifier with Class-TD efficiency, NomadLink network monitoring, and support for both Hi-Z (70V and 100V) and Lo-Z (2–16 ohm) speaker loads in a 2U rack-mount chassis. Suited for commercial sound installations in houses of worship, convention centers, performing arts venues, retail, hospitality, and large multipurpose facilities, the C 68:4 gives AV integrators a professionally monitored, installation-ready amplifier with remote control capability via NomadLink and DeviceControl software. The Lab Gruppen C 68:4 4-channel NomadLink amplifier is a cost-effective specification choice for high-power, network-monitored commercial audio without onboard DSP overhead.

Product Description

The C 68:4 delivers 6,800W across four channels, with up to 1,700W per channel into 4 ohms. Its Class-TD output stage retains the sonic quality of Class-A/B amplification at Class-D energy efficiency, and the Regulated Switch Mode Power Supply (R.SMPS) maintains consistent output across varying mains conditions. The Intercooler copper cooling system provides effective thermal management for continuous-duty commercial installation environments.

NomadLink network monitoring is built in, enabling remote parameter display, channel mute, and power on/off control via DeviceControl software over Ethernet. The NLB 60E NomadLink Bridge and Network Controller is required separately for network connectivity. Four balanced 3-pin Phoenix connector inputs and four 2-pole barrier strip outputs provide clean permanent installation wiring with no adapters required. A scalable Voltage Peak Limiter (VPL) and bridge-mode capability allow configuration for a range of loudspeaker types and application demands. The full protection scheme covers current, voltage, DC, temperature, short-circuit, and open-load events. Front-panel LED indicators provide real-time status visibility. The 2U rack chassis includes a removable dust filter grille for maintenance in clean installation environments.

Key Features

• 6,800W Total Output Power — Up to 1,700W per channel into 4 ohms across all four channels simultaneously.
• NomadLink Network Monitoring — Remote display of key amplifier parameters and control of channel mutes and power on/off via DeviceControl software (NLB 60E required).
• Hi-Z and Lo-Z Speaker Support — Each channel drives 2, 4, 8, and 16 ohm loads plus 70V and 100V constant-voltage speaker distribution.
• Class-TD Output Stage — Class-A/B sonic quality at Class-D efficiency with Intercooler copper heat dissipation for extended peak performance.
• R.SMPS Power Supply — Regulated Switch Mode Power Supply ensures stable output regardless of mains voltage variation.
• Scalable Voltage Peak Limiter (VPL) — Adjustable VPL protects loudspeakers from voltage peaks while maintaining dynamic range.
• Bridge-Mode Operation — Up to 3,400W bridged into 8 ohms and 3,200W bridged at 140V for high-power single-zone requirements.
• Comprehensive Protection — Current, voltage, DC, temperature, short-circuit, and open-load protection with LED status indication.
• Installation-Ready Wiring — 4 x 3-pin Phoenix balanced inputs and 4 x barrier strip 2-pole screw-terminal speaker outputs.
• 2U Rack-Mount Chassis — Compact 2U design with removable dust filter, suitable for equipment rack installation in commercial facilities.

Typical Applications

• House of worship
• Auditorium
• Conference room
• Multi-purpose room
• Commercial meeting space

Technical Specifications

Frequently Asked Questions

Q: How does the C 68:4 differ from the C 88:4?

A: The C 68:4 delivers 6,800W total output compared to the C 88:4's 8,800W. Per-channel into 4 ohms the C 68:4 delivers 1,700W versus 2,100W on the C 88:4. Both models share the same NomadLink monitoring architecture, Class-TD output stage, and connector layout. The C 68:4 is appropriate where 4-channel output requirements don't demand the full power headroom of the C 88:4.

Q: Does the C 68:4 include DSP?

A: No. The C 68:4 provides NomadLink network monitoring for remote status and control, but does not include onboard DSP. External signal processing is recommended for loudspeaker management. For an amplifier with onboard Lake DSP and Dante, see the D Series Lake range.

Q: What is required to use NomadLink network monitoring?

A: The C 68:4 is NomadLink-ready but requires the NLB 60E NomadLink Bridge and Network Controller (sold separately) to connect the amplifier to an Ethernet network for DeviceControl software monitoring and control.

Q: Can the C 68:4 power 70V or 100V speaker systems?

A: Yes. Each channel supports Hi-Z operation at 70V and 100V constant voltage alongside Lo-Z loads from 2 to 16 ohms, making it suitable for distributed speaker systems commonly found in commercial installations.

Q: What does bridge mode provide on the C 68:4?

A: Bridge mode combines two channels into one for higher single-zone output: up to 3,400W into 8 ohms and 3,200W at 140V. This is useful for driving demanding subwoofers or high-SPL zones from a single amplifier.

Q: What protection features are built into the C 68:4?

A: The amplifier provides protection against current overload, overvoltage, DC faults, thermal overload, short circuits, and open-load conditions. All events are indicated via front-panel LEDs.

Q: What is the warranty and service support for the C 68:4?

A: Lab Gruppen C Series products carry the manufacturer's standard warranty. Creation Networks provides pre-sales and specification support, and can connect customers with authorized Lab Gruppen service centers.