AD ULT4.20 Professional Class D Power Amplifier

AD ULT4.20 Professional 4-Channel Class D Power Amplifier

The AD ULT4.20 is a high-performance 4-channel Class D professional power amplifier engineered for demanding live sound, touring, fixed installations, churches, concert venues, and rental companies. Designed with advanced switching power technology, the ULT4.20 delivers exceptional power, outstanding efficiency, and reliable operation while maintaining a lightweight 1U rack-mount design.

Each channel produces up to 2,000W RMS at 8Ω, 3,300W RMS at 4Ω, and 5,000W RMS at 2Ω, making it ideal for driving full-range speakers, stage monitors, subwoofers, and professional line array systems. In bridge mode, the amplifier delivers up to 7,000W RMS at 4Ω, providing massive output for high-power applications.

The ULT4.20 features a wide frequency response of 10Hz–20kHz (±0.35dB), excellent signal-to-noise performance, high damping factor, and low distortion, ensuring powerful bass, detailed midrange, and crystal-clear high frequencies. Comprehensive protection circuitry safeguards the amplifier against short circuits, DC faults, overheating, overload, ultrasonic interference, RF interference, and voltage peaks for dependable operation during long performances.

Built with professional XLR balanced inputs and Neutrik NL4 speaker outputs, the AD ULT4.20 integrates easily into any professional audio system. Its efficient cooling system and rugged steel chassis make it an excellent choice for continuous operation in the most demanding environments.

Key Features

• 4-Channel Professional Class D Power Amplifier
• 1U Lightweight Rack-Mount Design
• Up to 4 × 5,000W RMS @ 2Ω
• 4 × 3,300W RMS @ 4Ω
• 4 × 2,000W RMS @ 8Ω
• Bridge Mode up to 2 × 7,000W RMS @ 4Ω
• Wide Frequency Response: 10Hz–20kHz
• High Damping Factor for Tight Bass Response
• Low THD and High Signal-to-Noise Ratio
• Advanced Protection Circuitry
• Balanced XLR Inputs
• Neutrik NL4 Speaker Outputs
• Intelligent Cooling Fan System
• Ideal for Line Arrays, PA Systems, Concerts, Churches, and Professional Installations