Lab Gruppen C 28:4 2800W 4-Channel Amplifier with NomadLink Network Monitoring - C284

Product Overview

The Lab Gruppen C 28:4 is a 2,800W 4-channel commercial installation amplifier with Class-TD efficiency and NomadLink network monitoring in a compact 2U rack-mount chassis. Designed for AV integrators specifying audio in conference rooms, huddle rooms, training rooms, boardrooms, and commercial meeting spaces, the C 28:4 provides a professionally monitored 4-channel amplifier with remote status display and control via NomadLink and DeviceControl software. The Lab Gruppen C 28:4 4-channel NomadLink amplifier is a practical specification for lower-power commercial sound installations requiring network visibility, Hi-Z and Lo-Z flexibility, and a compact installation footprint.

Product Description

The C 28:4 delivers 2,800W across four channels at up to 700W per channel into 4 ohm and 8 ohm loads. Its Class-TD output stage maintains Class-A/B sonic quality at Class-D efficiency, and the Regulated Switch Mode Power Supply (R.SMPS) ensures consistent output regardless of mains fluctuations. The Intercooler copper cooling system provides effective thermal management in continuous-duty commercial environments. NomadLink network monitoring is built in, enabling key amplifier parameters to be displayed and controlled via DeviceControl software when paired with the NLB 60E NomadLink Bridge and Network Controller (required separately).

Four balanced 3-pin Phoenix connector inputs and four 2-pole barrier strip screw-terminal outputs provide clean permanent wiring for installation environments. A scalable Voltage Peak Limiter (VPL) and selectable gain allow the amplifier to be matched to external signal processing equipment. Bridge-mode operation enables up to 1,400W into 16 ohms and 1,400W at 140V/200V for single-zone applications requiring more output than a single channel provides. The protection scheme covers current, voltage, DC, temperature, short-circuit, and open-load events with front-panel LED indication. A removable dust filter grille is included for maintenance in clean installation environments.

Key Features

• 2,800W Total Output Power — Up to 700W per channel into 4 ohm and 8 ohm loads across all four channels simultaneously.
• NomadLink Network Monitoring — Remote display of key parameters and control of channel mutes and power on/off via DeviceControl (NLB 60E required separately).
• Hi-Z and Lo-Z Operation — Each channel supports 2, 4, 8, and 16 ohm Lo-Z loads plus 70V and 100V Hi-Z constant-voltage speaker distribution.
• Class-TD Output Stage — Delivers Class-A/B sonic quality at Class-D efficiency with Intercooler copper thermal management.
• R.SMPS Power Supply — Regulated Switch Mode Power Supply for stable output across varying mains conditions.
• Scalable VPL and Selectable Gain — Adjustable Voltage Peak Limiter and gain selection for matching to external signal processing equipment.
• Bridge-Mode Operation — Up to 1,400W bridged into 16 ohms and 1,400W at 140V/200V for single-zone applications.
• Comprehensive Protection — Current, voltage, DC, temperature, short-circuit, and open-load protection with LED status indication.
• Installation-Ready Connectors — 4 x 3-pin Phoenix balanced inputs, 4 x 2-pole barrier strip speaker outputs for permanent wiring.
• 2U Compact Chassis — Rack-mount 2U with removable dust filter, suitable for equipment rack installation in commercial facilities.

Typical Applications

• Boardroom
• Conference room
• Huddle room
• Training room
• Commercial meeting space

Technical Specifications

Frequently Asked Questions

Q: What is the typical use case for the C 28:4 versus the C 48:4?

A: The C 28:4 provides 2,800W total across four channels (up to 700W per channel into 4 ohms) versus 4,800W on the C 48:4 (up to 1,200W per channel into 4 ohms). The C 28:4 is well suited for conference rooms, huddle rooms, and training spaces where speaker loads are moderate and the system does not require high SPL output. The C 48:4 is preferred where higher continuous power per zone is needed.

Q: Does the C 28:4 have onboard DSP?

A: No. The C 28:4 provides NomadLink network monitoring for remote status and control but does not include onboard DSP. An external DSP or audio matrix processor is recommended for loudspeaker management and signal routing. For onboard Lake processing with Dante, see the D Series Lake range.

Q: What is needed to enable NomadLink monitoring on the C 28:4?

A: The NLB 60E NomadLink Bridge and Network Controller is required separately. Once connected, DeviceControl software displays key amplifier parameters and provides remote control of channel mutes and power on/off over the network.

Q: Can the C 28:4 drive 70V or 100V speaker systems?

A: Yes. Each channel supports 70V and 100V Hi-Z constant-voltage operation alongside Lo-Z loads from 2 to 16 ohms, making the C 28:4 suitable for distributed speaker systems in commercial facilities using constant-voltage distribution.

Q: What does bridge mode provide on the C 28:4?

A: Bridge mode pairs two channels to increase single-zone output. The C 28:4 delivers up to 1,400W bridged into 16 ohms and 1,400W bridged at 140V/200V, suitable for applications where a single zone needs more output than one channel alone can provide.

Q: What protection features does the C 28:4 provide?

A: The amplifier includes a comprehensive protection scheme covering current overload, overvoltage, DC faults, thermal protection, short-circuit protection, and open-load detection. The scalable VPL additionally limits voltage peaks to protect connected loudspeakers.

Q: What warranty and support apply to the C 28:4?

A: Lab Gruppen C Series products carry the manufacturer's standard warranty. Creation Networks provides pre-sales support and can assist customers in locating authorized Lab Gruppen service centers for technical and warranty service.