Class D Amplification for High-Power Line Array Speakers

Line array speakers often require high output power within a limited rear-panel installation space.

Class D amplification is particularly suitable for this application because of its high efficiency and compact architecture. Lower power losses also help reduce the amount of heat that must be managed inside the speaker enclosure.

OMB has extensive experience in Class D amplifier development and power supply design, allowing the amplifier, thermal system and power architecture to be considered together when developing modules for demanding professional audio applications.

For high-output line array systems, thermal stability is as important as maximum power. Proper cooling and protection design help the module maintain reliable operation during concerts, touring and extended professional use.

How to Choose a Line Array Amplifier Module

Selecting the correct amplifier module should begin with the loudspeaker configuration rather than simply choosing the highest wattage.

Speaker Driver Configuration

First determine whether the speaker is a 2-way or 3-way system and identify the impedance and RMS power requirements of each driver.

For example, a bi-amplified line array normally requires independent amplifier channels for the low-frequency and high-frequency sections.

Output Power

The amplifier output should be matched to the impedance, continuous power handling and required headroom of the loudspeaker drivers.

Important information includes:

● Driver RMS power
● Nominal impedance
● Number of drivers
● Required amplifier channels
● Target SPL
● Intended operating conditions

Channel Configuration

Different cabinet designs may require mono, dual-channel or multi-channel amplification.

Multi-way line array speakers typically benefit from independent amplifier channels so that DSP crossover, EQ and limiter settings can be optimized for each driver section.

DSP Requirements

Consider which processing functions need to be integrated into the speaker.

Typical requirements include crossover, PEQ, delay, limiter, FIR processing, presets and system monitoring.

Cooling and Thermal Management

Touring and live sound systems may operate at high output for long periods.

When selecting a line array power amplifier module, evaluate not only peak power but also cooling design, thermal protection and continuous operating capability.

Interfaces and Network Control

Professional line array systems may require XLR audio connections, control interfaces or network communication for centralized speaker management.

OMB can evaluate interface and network control requirements during module customization.

Line Array Amplifier Module Selection

OMB HDL amplifier modules are designed for different active speaker and line array requirements.

Final output power, impedance, channel configuration and DSP functions should be selected according to the loudspeaker design and project requirements.

Line Array Amplifier Module vs. External Power Amplifier

Both architectures are widely used in professional audio, but they serve different system designs.

For active line array manufacturers, amplifier modules are particularly useful when developing compact, self-powered speaker systems.

Applications

Active Line Array Speakers

Line array amplifier modules can power LF and HF sections independently while DSP manages crossover, EQ, limiting and other speaker parameters.

Active Subwoofers

High-power modules can be configured for low-frequency drivers where high current capability, thermal management and reliable protection are especially important.

Touring and Rental Systems

Integrated amplification reduces external rack requirements and simplifies system deployment for mobile professional audio systems.

Concert and Event Audio

High-output Class D modules are suitable for line array systems used at concerts, festivals, corporate events and other professional sound reinforcement applications.

OEM Professional Speaker Manufacturing

Speaker brands and system manufacturers can use amplifier modules as an integrated electronics platform for developing their own active speaker products.

Custom Line Array Amplifier Module Solutions

Different loudspeaker cabinets require different amplifier specifications. OMB supports OEM amplifier module development based on your speaker design and target market.

Available customization can include:

● Output power
● Number of amplifier channels
● DSP functions
● Input and output interfaces
● Network communication protocols
● Mechanical dimensions and panel design
● Logo and branding
● Product documentation and packaging

To recommend the correct solution, provide your speaker driver configuration, impedance, RMS power, cabinet type and required DSP functions.

OMB's engineering team can review the requirements, develop a sample and verify the module before mass production.

Quality Control for Professional Amplifier Modules

Reliability is critical for amplifier modules installed inside professional speakers because the electronics may operate under high power, vibration and elevated internal temperatures.

OMB quality verification can include:

● PCB testing
● Audio performance testing
● Power output verification
● Burn-in testing
● Thermal stability testing
● Safety inspection

Prototype verification is also available before mass production to help confirm that the amplifier module matches the speaker system and required performance.

Why Choose OMB for Line Array Amplifier Modules?

OMB has focused on professional audio development since 2014, with experience in Class D power amplifiers, DSP processing, power supply technology and active speaker electronics.

Instead of supplying only a generic amplifier board, OMB can support the complete interaction between amplifier power, DSP configuration, speaker drivers and system control.

For speaker manufacturers, audio brands and professional system integrators, this provides a more practical route from amplifier module selection to customized active speaker development.