AC403D

4 Channel Network DSP Power Amplifier
SKU: PLU-AC403D
SKU: PLU-AC403D

The Plus Audio 4 × 300W DSP Amplifier is a multifunctional four-channel network DSP power amplifier designed for professional sound reinforcement across both fixed installation and commercial audio environments. Delivering 300W per channel at 8Ω, it combines flexible amplification with advanced DSP processing and network-based control.

Built-in DSP provides comprehensive signal processing for precise system optimisation, including compressor, expander, limiter, noise gate, parametric EQ, matrix routing, and delay functions. Configuration and monitoring can be managed through the intuitive web interface or the integrated colour LCD display, providing convenient access to system settings and real-time amplifier status.

With standard four-channel AES67 network audio and optional Dante™ connectivity, the amplifier integrates easily into modern networked audio systems. Support for both low-impedance and constant-voltage operation, including 8Ω, 4Ω, 70V, and 100V configurations, provides the flexibility required for a wide range of professional installations.

The amplifier supports multiple operating modes, allowing users to switch between bridge and matrix configurations to suit different system requirements. Input gain can be adjusted from 26–44 dB, while the integrated FIR processing provides 4 × 2048-tap filters for accurate phase and system optimisation.

Network control is provided via TCP/IP, enabling multi-device management and remote power control. Integration with Mconsole 3.0 allows connected amplifiers to be identified and accessed directly through the web interface, simplifying configuration and management of larger audio systems.

A wide-range 100–240V power supply, configurable startup states, and real-time monitoring of amplifier operating status ensure dependable operation and convenient system management across professional audio applications.

  • 4 × 300W output at 8Ω
  • Standard 4-channel AES67 network audio
  • Optional Dante™ network audio
  • Built-in DSP processor
  • Compressor, expander, limiter, noise gate, parametric EQ, matrix routing, and delay
  • Standard FIR processing with 4 × 2048-tap filters
  • Constant-voltage and low-impedance operation: 100V / 70V / 8Ω / 4Ω
  • Freely configurable bridge and matrix operating modes
  • Adjustable amplifier gain from 26–44 dB
  • Integrated colour LCD display
  • Real-time remote monitoring of amplifier operating status
  • Remote power on/off control
  • TCP/IP network control for multi-device management
  • Web-based configuration and control
  • Amplifier identification through the Web interface
  • Mconsole 3.0 integration with direct device access via hyperlink
  • Configurable power-up status: Power On / Standby
  • Wide-range 100–240V power supply
Amplifier Channels 4
Output Power 4 × 300W @ 8Ω / 4 × 600W @ 4Ω
Bridged Power 2 × 900W @ 8Ω
Minimum Load 4Ω per channel / 8Ω bridged
100V Output 100V
70V Output 70V
Input Connectors 4 × Phoenix terminal inputs
Output Connectors 2 × speakON
Link Output Phoenix terminal LINK OUT
Maximum Input Level 19dBu / 6.904V
Gain 26–44dB
Input Impedance 20kΩ
SNR 95dB
Frequency Response 20Hz–20kHz (±0.5dB) @ 1W, 8Ω
THD+N <1% @ 1W to full power
Channel Separation <−78dB @ 1kHz, 0dBu
Damping Factor 150
CMRR >60dB @ 1kHz, 0dBu
Sampling Rate 96kHz / 24-bit
Audio Sources Analogue, AES67, optional Dante™, pink noise, white noise, sine wave
Dante™ Optional 4-channel Dante™
DSP Matrix 4 × 4 matrix
Input EQ 15-band parametric EQ
Output EQ 10-band parametric EQ
Speaker EQ 15-band parametric EQ
Crossover Butterworth & Bessel: 6–48dB/oct; Linkwitz-Riley: 12–48dB/oct
Input Delay 4 × 2000ms
DSP Output Delay 4 × 2000ms
Speaker Delay 4 × 200ms
Compressor Soft knee, threshold, attack, compression ratio, release
Limiter Threshold −90dBu to 8.2dBu; release 1–2895ms
Noise Gate Threshold −90dBu to 0dBu; attack/release 1–2895ms
DSP Presets 80 preset slots
Operating Modes Bridge, Free Matrix
Constant-Voltage / Low-Impedance 100V / 70V / 8Ω / 4Ω
Control Ethernet / TCP/IP
Network 100Base-TX / RJ45
Remote Control Power on, standby, DSP monitoring
Amplifier Monitoring Temperature, power, voltage, current
Display 320 × 240 pixel IPS colour display
Cooling Intelligent temperature-controlled fan
Protection Audio limiter, over-temperature, DC, high frequency, short circuit, back EMF, peak current limiter, inrush current limiter, power-on delay, circuit breaker, over/under-voltage protection
Power Supply 100–240V AC, 50/60Hz
Dimensions 483 × 305 × 44.5mm
Net Weight 3.9kg
Gross Weight 5kg
Package Dimensions 527 × 447 × 93mm