AD ULT4.20 Professional Class D Power Amplifier

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

The AD ULT4.20 is a flagship 4-channel Class D professional power amplifier built to deliver exceptional power, efficiency, and reliability for the most demanding sound reinforcement applications. Designed for touring companies, concert productions, churches, stadiums, clubs, and permanent installations, the ULT4.20 provides outstanding audio performance in a compact and lightweight 1U rack-mount chassis.

Delivering 4 × 2,000W RMS at 8Ω, 4 × 3,300W RMS at 4Ω, and 4 × 5,000W RMS at 2Ω, the AD ULT4.20 effortlessly powers professional full-range speakers, stage monitors, subwoofers, and large-scale line array systems. For applications requiring maximum output, Bridge Mode delivers an impressive 2 × 7,000W RMS at 4Ω, making it an excellent choice for high-powered subwoofer systems and large venue installations.

Featuring advanced Class D amplifier technology, the ULT4.20 offers a 10Hz–20kHz (±0.35dB) frequency response, high damping factor for accurate low-frequency control, ultra-low distortion, and a high signal-to-noise ratio for clean, dynamic sound reproduction. Its intelligent protection system safeguards against short circuits, DC faults, overload, overheating, RF interference, ultrasonic signals, and voltage peaks, ensuring reliable operation even under continuous heavy-duty use.

Equipped with balanced XLR inputs, professional Neutrik NL4 speaker outputs, and an intelligent variable-speed cooling system, the AD ULT4.20 is engineered to provide years of dependable performance for professional audio applications.

Key Features

• Professional 4-Channel Class D Power Amplifier
• Compact 1U Lightweight Rack Design
• 4 × 2,000W RMS @ 8Ω
• 4 × 3,300W RMS @ 4Ω
• 4 × 5,000W RMS @ 2Ω
• Bridge Mode: 2 × 7,000W RMS @ 4Ω
• Wide Frequency Response: 10Hz–20kHz (±0.35dB)
• High Damping Factor for Powerful, Accurate Bass
• Low THD and High Signal-to-Noise Ratio
• Advanced Protection System (Short Circuit, DC, Overload, Overheat, RF & Voltage Peak Protection)
• Balanced XLR Inputs
• Neutrik NL4 Speaker Outputs
• Intelligent Variable-Speed Cooling Fans
• Ideal for Professional PA Systems, Touring, Line Arrays, Concerts, Churches, Clubs, Theaters, and Fixed Installations.