The AtlasIED LMA401 is a high-output, single-channel Class D amplifier designed for demanding commercial audio installations requiring increased power, scalability, and long-term reliability.

Delivering 400 watts of output power, the LMA401 supports low-impedance (2Ω, 4Ω, 8Ω) and constant-voltage (25V, 70.7V, 100V) loudspeaker systems, making it ideal for distributed audio systems and high-SPL reinforcement applications.

It can operate as a standalone amplifier or integrate seamlessly as an expansion amplifier with AtlasIED DMA Series mixer amplifiers.

AtlasIED LMA401 Key Features

• 400W single-channel Class D amplifier

• Supports 2Ω, 4Ω, 8Ω, 25V, 70.7V, and 100V systems

• Link Bus compatibility with DMA Series mixer amplifiers

• Push Here Diagnostic (PHD) speaker verification system

• Global auto-sensing switch-mode power supply

• Balanced line and summed RCA inputs

• Priority mute GPI

• Remote level control capability (DMA-V, DMA-VS)

• Rear panel level attenuators

• Convection cooled (no fan noise)

• Compact 1RU half-rack design

• Rack kit included

Flexible Deployment Options

The LMA401 can be deployed in multiple configurations:

• Standalone power amplifier

• Secondary zone amplifier

• Subwoofer amplifier

• Expansion amplifier via Link Bus

When connected to a DMA Series mixer amplifier using the proprietary Link Bus, the LMA401 becomes a gain-matched extension of the system. It can be placed up to 100 meters away, allowing flexible equipment room layouts and distributed rack locations.

Power & Performance

The LMA401 delivers stable, high-voltage and high-current output simultaneously, ensuring reliable operation even with complex loudspeaker loads.

A global auto-sensing switch-mode power supply ensures consistent performance across international power standards.

Output Power

• 400W @ 4Ω, 8Ω, 70.7V, 100V

• 200W @ 25V

• 200W @ 2Ω

Push Here Diagnostic (PHD)

The integrated PHD Speaker Diagnostic System allows installers to quickly verify speaker wiring and load conditions at the push of a button.

Benefits include:

• Faster commissioning

• Reduced installation time

• Immediate load verification

• Increased system reliability

Connectivity & Control

• 1 Balanced Line Input (3.5mm Euroblock, 3-position)

• 1 RCA Input (L & R summed, connectors in parallel)

• Input Impedance:

  • 20kΩ Balanced

  • 10kΩ Unbalanced

• Input Sensitivity:

  • 775mV Balanced

  • 316mV RCA

• Priority Mute GPI

• 1W Standby GPI

• Compatible with DMA-V and DMA-VS remote level controllers

Rear-panel attenuators allow precise output level adjustment during commissioning.

Mechanical & Installation

• Type: Power Amplifier, 1 Channel

• Amplifier Topology: Class D

• Cooling: Convection cooled (fanless)

• Form Factor: 1RU, half-rack width

• Rack kit included

The compact half-rack design allows flexible mounting in equipment racks or cabinets while conserving valuable rack space.

Applications

The LMA401 is ideal for:

• Restaurants

• Presentation rooms

• Classrooms

• Retail background and foreground music systems

• Multi-zone commercial audio systems

• High-SPL reinforcement installations.

Technical Specifications

General

• Type: Power Amplifier, 1 Channel

• Amplifier Topology: Class D

• Cooling: Convection cooled (fanless)

• Form Factor: 1RU, half-rack width

• Rack Kit: Included

Output Power

• 400W @ 4Ω

• 400W @ 8Ω

• 400W @ 70.7V

• 400W @ 100V

• 200W @ 25V

• 200W @ 2Ω

Supported Load Configurations

• 2Ω

• 4Ω

• 8Ω

• 25V

• 70.7V

• 100V

Inputs

• Input Type:

  • 1 Balanced Line Input

  • 1 RCA Input (L & R summed; connectors in parallel)

• Input Connector Type:
  3.5mm Euroblock, 3-position

• Input Impedance:

  • 20kΩ (Balanced)

  • 10kΩ (Unbalanced)

• Input Sensitivity:

  • 775mV (Balanced)

  • 316mV (RCA)

• Control & Integration

• Link Bus: Compatible with DMA Series mixer amplifiers

• Max Link Bus Distance: Up to 100 meters

• PHD (Push Here Diagnostic): Speaker load verification system

• Remote Level Control: Compatible with DMA-V and DMA-VS

• Rear Panel Level Attenuators: Yes

• Priority Mute GPI: Yes

• 1W Standby GPI: Yes

Power Supply

• Type: Global auto-sensing switch-mode power supply

• Designed for high voltage and high current output simultaneously

Why Choose the LMA401?

The AtlasIED LMA401 combines high output power, multi-impedance flexibility, and intelligent diagnostics in a compact, installation-friendly format.

Its ability to function independently or expand DMA Series systems makes it a versatile and scalable solution for modern commercial audio installations.