LAB GRUPPEN CMA2402_US1 2 x 240 Watt Commercial Mixer Amplifier with 8 Inputs (CMA2402_US1)

Vendor: Lab Gruppen
LAB GRUPPEN CMA2402_US1 2 x 240 Watt Commercial Mixer Amplifier with 8 Inputs (CMA2402_US1) The 2 x 240 Watt Commercial Mixer Amplifier, like the CMA2402, seems to be a versatile solution designed for...

LAB GRUPPEN CMA2402_US1 2 x 240 Watt Commercial Mixer Amplifier with 8 Inputs (CMA2402_US1)

The 2 x 240 Watt Commercial Mixer Amplifier, like the CMA2402, seems to be a versatile solution designed for commercial and industrial settings requiring distributed audio while emphasizing power conservation and reduced operating expenses. Its ability to deliver high-quality sound across both Low-Z (4/8 Ohm) and High-Z (70/100 V) loudspeaker configurations provides flexibility in channel usage, catering to various audio setups. The unit's versatility extends to its suitability for different applications, making it a practical choice for a range of venues such as bars, restaurants, retail spaces, hotels, corporate environments, educational institutions, and other places that require background music and/or a public address system. One of its key strengths appears to be its user-friendly nature, allowing for easy installation and operation, even for individuals without technical expertise. This ease of use can be especially advantageous in settings where non-technical personnel may need to manage or operate the audio system. Overall, the CMA2402 seems to strike a balance between performance, flexibility, and ease of use, making it a suitable choice for diverse commercial and industrial applications that require distributed audio solutions while focusing on efficiency and cost-effectiveness.

Easy to Install

The CMA2402's design versatility seems impressive. Its built-in rubber feet provide a convenient option for placement on desks, shelves, or any flat surface without requiring additional installation steps. This flexibility allows for quick and easy deployment in various settings. Moreover, the provision of optional rack mounting hardware adds another layer of adaptability. This feature allows one or multiple units to be securely housed and protected inside an enclosure. The flexibility extends to accommodating a single unit in a half 19" rack or full rack enclosure or pairing two amplifiers side-by-side within a single rack space. This versatility in rack mounting options ensures compatibility with different rack sizes and setups, catering to varying installation requirements. Additionally, the included brackets enable alternative mounting options, such as wall mounting or positioning the unit under a table or shelf. This flexibility in mounting choices enhances the unit's adaptability to different environments and installation preferences, offering multiple ways to integrate it into a space while ensuring stability and security. Overall, the CMA2402's design, with its varied mounting options, provides extensive flexibility in placement and installation, making it suitable for a wide range of setups and environments.

Automatic Power On/Off

The CMA2402's power management system sounds remarkably efficient and user-friendly. Its flexible power scheme offers seamless and automatic power on/off functionality based on input signals, reducing power consumption when there's no active signal present. This feature is beneficial for environments where audio signals may not be continuously present, ensuring energy conservation without the need for manual intervention. The system's capability to enter sleep mode after 20 minutes without an input signal further contributes to power efficiency. This auto-sleep function is designed to minimize power consumption during periods of inactivity, promoting energy-smart operation. Upon detection of a signal by the Auto Ramp circuit, the amplifier swiftly powers on, resuming normal operation without user intervention, ensuring that audio signals are promptly amplified when present. Additionally, the amplifier offers convenient control options. It can be instantly forced into standby mode or awakened using the front panel power button, providing users with manual control when needed. Overall, this power management system not only optimizes energy consumption but also simplifies operations by automating power processes. Its ability to seamlessly transition between power states based on input signals ensures efficient and hassle-free operation, making it an ideal choice for environments where energy conservation and ease of use are priorities.

Sublimely Simple Controls

CMA2402’s controls are sublimely intuitive, allowing the operator to quickly make adjustments. The front panel power button and Master volume knob are easily accessible, enabling virtually anyone to operate the system. Bass and Treble controls are also available for fine-tuning – but require a tool when making changes.

Easy to Hook Up

For connecting a balanced source such as a mixer or audio processor, a standard 3-pin Euroblock Input socket is provided. Alternatively, RCA cables can be connected for unbalanced stereo sources (summed to mono), such as players, phones, or computers, however only one input source should be used at a time. Loudspeaker Output is provided in the form of a standard 2-pin Euroblock socket.

Output Configuration

The CMA2402 offers intuitive configuration options for its flexible outputs, conveniently located adjacent to the rear panel Euroblock output connectors. The dipswitches provided allow for a straightforward selection of different output configurations—100 V, 70 V, 8 Ω, or 4 Ω operation—individually per channel. This configuration not only sets the maximum voltage output but also adjusts the gain through the device, providing a versatile setup catering to various loudspeaker configurations and impedance requirements. Additionally, the amplifier includes an individual control for engaging the built-in high-pass filter. This feature is particularly crucial for constant voltage systems as it helps prevent saturation on transformer-enabled loudspeakers. Utilizing the high-pass filter assists in maintaining sound integrity, ensuring optimal performance, and safeguarding against potential issues that might arise with certain speaker setups. By offering these intuitive configuration options directly at the output connectors, the CMA2402 simplifies the setup process, allowing users to adapt the amplifier's output characteristics to match the specific requirements of their loudspeaker systems while ensuring sound quality and integrity.

Expandable Remote Control

The RJ45 receptacle on the rear panel opens up a broad range of remote control options, including the CRC-V Series of wall controllers and a stylish tabletop controller, the LAB.LEVEL. All can be interconnected via inexpensive and readily available Ethernet cabling.

System Scalability

The CMA2402, being part of a family of products offering single and dual-zone options, presents a versatile solution for commercial installations that evolve or expand over time. Its compatibility within this product family allows for seamless integration, ensuring consistency and compatibility across the system as it grows or adapts. The amplifier's individual zone volume control and remote control capabilities enhance its flexibility as a building block within a dynamic and scalable system. This allows for precise control over specific zones or areas within the installation, enabling adjustments to accommodate different preferences or varying environmental needs. By serving as an ideal building block, the CMA2402 contributes to creating a scalable and adaptable system solution. Its ability to be a part of a broader product range and its individual zone control features make it well-suited for commercial setups that require flexibility, expansion, and dynamic control over different zones or areas within a space.

Real-World Energy Savings

The CMA2402 2 x 240 Watt Commercial Amplifier makes it easy to bring highest-quality music and announcements to business and industrial environments in an easy to integrate – and even easier to operate system. Plus, with features such as its Auto Ramp and revolutionary direct drive constant power technology, the energy efficient CMA2402 can generate enough energy savings to pay for itself in virtually no time at all.


  • 2 x 120 Watt mixer amplifier for commercial and industrial applications

  • Low-Z (4/8 Ohm) and High-Z (70/100 V) operation per output with switchable high-pass filter

  • 8 mic/line inputs with individual volume controls wand output routing

  • Individual front panel master volume and bass/treble controls for each output

  • Configurable priority muting function for background music override

  • Direct drive, constant power technology for superior audio performance and reliability

  • GPI remote volume control using standard RJ-45 connector and Ethernet cable

  • Auto Ramp circuitry for quiet and fast power up/down enables realworld energy savings

  • Front panel power control button for direct access

  • Aux outputs for expansion to additional amplifiers

  • Rack-mountable 1U, 19" enclosure with brackets for rack mounting

  • Euroblock type mic/line input and output connectors

  • Convection-cooled, fan-less amplifier technology for low noise

Maximum Output Power
4 or 8 Ω per channel

240 W

Number of Amplifier Channels


Minimun Load Impedance
4 Ω mode

4 Ω

8 Ω mode

8 Ω

70 V output mode

20 Ω

100 V output mode

42 Ω

Audio Outputs
Amplifier output

4-pin Euroblock connector

Aux output

2 x 3-pin Euroblock connector

Aux output max level

4.88 V (16 dBu)

Audio Inputs
Mic/Line with priority/ ducking input

2 x 5-pin Euroblock connector (channel A, E)

Mic/Line with summed RCA

6 x 3-pin Euroblock connector, 6 x stereo RCA (channel B, C, D, F, G, H) 3


Balanced mic/line: 20 kΩ Unbalanced line and RCA: 10 kΩ

Input sensitivity for max amplifier output or nominal (+4 dBu) aux output level

Mic: 0.038 V (-26 dBu)
Balanced: 1.23 V (+4 dBu)
RCA: 0.62 V (-2 dBu) each for mono sum RCA

Maximum input level

4.88 V (+16 dBu)

Microphone phantom power

48 V


Power standby button, input and output gain control, tone controls - bass and treble


Load config - (4 Ω/8 Ω/70 V/100 V), switchable 80 Hz high-pass filter, mic/line switch, vox/ducking threshold control, phantom power, input routing (2-channel models only)

Tone Controls

±10 dB @ 100 Hz


±10 dB @ 10 kHz


On (blue), force standby (red), standby (yellow)


Signal (green LED) : >12.3 mV (-36 dBu)
Fault (red LED) : Clip


Signal (green LED) : >-50 dBu
Fault (red LED) : Overheat, DC fault, over current, etc
Limit (red LED) : Output limit

Output circuit type

Class D

Remote connector

2 x RJ45
Ethernet connector

Distortion, 1/8 rated power


Frequency response

20 Hz to 20 kHz, +0.5/-1 dB

Crosstalk (2 channel models)

>70 dB


>97 dBA

High-pass filter

80 Hz HPF

Circuit Protection

Convection-cooled, fanless

Amplifier protection

Thermal protection, over current protection, DC protection, high frequency protection

Load protection

Controlled start and shutdown behaviour, DC-fault protection

Power Supply, Voltage (Fuse)
Main voltage

100-240 V~, 50/60 Hz with active power factor correction


T 10 A H 250 V

Power consumption 1/8th rated power@ 4 Ω

140 W

Mains connector

Standard IEC connector

Dimensions (H x W x D)

44 x 437 x 248 mm (1.7 x 17.2 x 9.8")


3.6 kg (7.9 lbs)


Brushed black anodized aluminum chassis with black painted steel bottom


CE, CCC, WEEE, cTUVus, PSE, RCM, RoHS, FCC part 15 Class B