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Auway PA400 2 Channel 70V 100V Class D Public Address Power Amplifier

Auway PA400 is a compact half-U 2-channel Class D public address amplifier, designed for commercial fixed audio projects. It supports dual working modes: 70V/100V constant voltage output for long-distance speaker laying, and 4Ω/8Ω low impedance output for conventional speakers. Adopting fanless convection cooling structure, the amp runs silently without noise, perfectly suitable for quiet indoor environments such as hotels, offices, cafes and schools. Equipped with complete overheat, short-circuit and overload protection circuits, it ensures stable continuous operation all day long. Ultra-low distortion sound delivers clear voice broadcast and pleasant background music, an ideal economical choice for commercial PA systems.
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  • PA400

  • Auway

1. Key Highlights

  • Ultra-slim half-U 2-channel Class-D power amplifier, ideal for rack mounting with minimal space occupation

  • Dual-mode output: 70V/100V constant voltage for long-distance public address, plus 4Ω/8Ω low impedance mode for standard passive speakers

  • Powerful output: 2×400W @8Ω, 2×600W @4Ω with ultra-clean audio reproduction

  • Fanless convection cooling design: no operational noise, stable performance and extended service life

  • Switchable 80Hz high-pass filter to reduce low-frequency rumble and enhance vocal clarity

  • Balanced & unbalanced dual inputs with signal link output, supporting amplifier cascading for multi-zone audio expansion

  • Full-range multi-protection system: thermal, overcurrent, DC fault and high-frequency protection to safeguard amplifier and speakers

  • 100-240V universal wide voltage input, compatible with commercial audio projects worldwide

2. Description

The PA400 is a professional half-U dual-channel Class-D power amplifier specially designed for commercial public address and background music systems used in various commercial premises.

Adopting high-efficiency Class-D digital amplification technology, it delivers high-fidelity, high-power sound output within a compact half-U chassis, perfectly solving space constraints for rack-mounted audio equipment installation. Users can switch working modes freely via the rear-panel load configuration switch: select 70V/100V constant voltage mode for long-distance PA wiring widely applied in commercial broadcasting, or switch to 4Ω/8Ω low-impedance mode to drive conventional loudspeakers. This flexible dual-mode design allows seamless matching with speakers of different power ratings and various cable lengths to meet diverse audio layout requirements.

Equipped with a selectable 80Hz high-pass filter, it effectively filters unnecessary subsonic noise and optimizes the clarity of background music and voice announcements. The fanless passive cooling system eliminates running hum completely, making it perfect for quiet indoor environments. Built-in comprehensive protection circuits including thermal protection, overcurrent protection, DC offset protection and high-frequency protection ensure safe continuous long-time operation and prevent damage to both the amplifier and connected speakers.

With dual balanced/unbalanced audio inputs and signal loop output ports, multiple amplifiers can be cascaded easily to expand more audio zones. Benefiting from ultra-low total harmonic distortion, flat frequency response and high signal-to-noise ratio, the PA400 consistently delivers crisp, stable and durable sound performance for all fixed commercial audio installations globally.

Item

Parameter

Model

PA400

Rated Output Power

2 × 400W (8Ω)

2 × 600W (4Ω)

Number of Output Channels

2

Nominal Load Impedance (70V Mode)

12Ω

Nominal Load Impedance (100V Mode)

25Ω

Amplifier Circuit Type

Class D

Input Impedance

Balanced: 20kΩ

Unbalanced (RCA): 10kΩ

Maximum Input Level

9.75V (+22 dBu)

THD @ 1/8 Rated Power

< 0.05%

Frequency Response

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

Crosstalk

> 85 dB

Signal-to-Noise Ratio

> 97 dBA

Power Supply

100-240V AC, 50/60Hz

Fuse

F10A

Front Panel Controls

Power button, Channel gain controls

Rear Panel Functions

Load configuration switch (4Ω/8Ω/70V/100V)

Switchable 80Hz high-pass filter

Cooling Method

Fanless convection cooling

Protection Functions

Thermal protection, Overcurrent protection, DC fault protection, High-frequency protection, Controlled soft start & shutdown

Connectors

Input: 2 × 3-pin terminal block

Signal Link Output: 2 × 3-pin terminal block

Speaker Output: 1 × 4-pin 5.08mm Euroblock connector

Packing Dimension

395 × 285 × 115 mm

Net Weight

3.2 KG

Gross Weight

4 KG

4. Application Scenarios

  • Shopping mall background music & public paging system

  • Hotel lobby, corridor and guest area background audio

  • School campus broadcasting & classroom PA system

  • Restaurants, cafes and office building background music playback

  • Factory workshop notification & emergency alarm broadcast

  • Conference rooms and small indoor venues fixed audio installation

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