4-Acoustic ST-4200 Professional Power Amplifier

High-Power 2-Channel Class-D Amplifier

The 4-Acoustic ST-4200 is a high-performance 2-channel Class-D power amplifier designed for professional touring, rental companies, concert venues, houses of worship, and permanent installations. Delivering exceptional power, efficiency, and reliability, the ST-4200 provides massive output while maintaining outstanding audio clarity and low distortion.

Capable of delivering 2 × 4000W at 2Ω, 2 × 3000W at 4Ω, and 2 × 2000W at 8Ω, the ST-4200 offers the power required for demanding professional speaker systems. In bridge mode, it delivers an impressive 8000W at 4Ω or 6000W at 8Ω, making it ideal for driving high-power subwoofers and large-scale sound reinforcement systems.

Built with advanced Class-D technology, the ST-4200 combines excellent power efficiency with a lightweight 2U chassis. Its ultra-fast slew rate, wide frequency response, and high damping factor ensure tight bass response, detailed audio reproduction, and superior loudspeaker control.

Comprehensive protection circuitry safeguards the amplifier against short circuits, overheating, DC faults, RF interference, ultrasonic frequencies, and mismatched loads, providing dependable performance even in the most demanding environments.

Key Features

• High-efficiency 2-Channel Class-D Amplifier
• 2 × 4000W @ 2Ω
• 2 × 3000W @ 4Ω
• 2 × 2000W @ 8Ω
• Bridge Mode: 8000W @ 4Ω / 6000W @ 8Ω
• Ultra-low distortion (THD ≤0.06%)
• High damping factor (>450:1) for precise speaker control
• Wide frequency response (10Hz–34kHz ±0.3dB)
• High signal-to-noise ratio (>100dBA)
• Selectable input sensitivity (0.775V / 1V / 1.5V / 2V)
• Variable-speed intelligent cooling fan
• Professional XLR balanced inputs
• Neutrik NL4 Speakon and Binding Post outputs
• Comprehensive protection against overload, short circuit, thermal, RF, DC fault, and clipping
• Standard 2U rack-mount design

Technical Specifications

Output Power

• 2 × 4000W @ 2Ω
• 2 × 3000W @ 4Ω
• 2 × 2000W @ 8Ω

Bridge Mode

• 1 × 8000W @ 4Ω
• 1 × 6000W @ 8Ω

Audio Performance

• THD+N: ≤0.06%
• Frequency Response: 10Hz – 34kHz (±0.3dB)
• Slew Rate: >60V/μs
• Damping Factor: >450:1
• Signal-to-Noise Ratio: >100dBA
• Channel Separation: >70dB
• Voltage Gain: 46dB

Connectivity

• Inputs: Balanced XLR
• Outputs: 2 × Neutrik NL4 Speakon + Binding Posts

Controls

• Front Power Switch
• Front Gain Controls
• Rear Input Sensitivity Selector
• Rear Operating Mode Selector

LED Indicators

• Signal (-30dB / -10dB)
• Signal (-4dB)
• Clip
• Protect
• Power
• Bridge Mode

Protection

• Short Circuit Protection
• Thermal Protection
• Overload Protection
• DC Fault Protection
• RF Protection
• Ultrasonic Protection
• Open Circuit Protection
• Load Mismatch Protection
• Power Supply Shutdown

General

• Amplifier Class: Class-D
• Operating Voltage: 220V ±10%, 50/60Hz
• Rack Size: 19" / 2U
• Dimensions: 483 × 451 × 88 mm
• Net Weight: 22.5 kg

Ideal Applications

• Concert Sound Systems
• Touring Productions
• Rental Companies
• Professional DJs
• Houses of Worship
• Stadiums & Arenas
• Nightclubs
• Convention Centers
• Large PA Systems
• High-Power Subwoofer Systems

The 4-Acoustic ST-4200 is engineered for audio professionals who demand exceptional power, efficiency, and reliability. With massive output, advanced protection, and outstanding sonic performance, it is the ideal amplifier for powering professional loudspeaker and subwoofer systems in the most demanding live sound environments.

Tags: 4-Acoustic ST4200, ST-4200, Class D Amplifier, Professional Power Amplifier, Concert Amplifier, Touring Amplifier, PA Amplifier, DJ Amplifier, Rack Amplifier, Live Sound, Subwoofer Amplifier, Professional Audio Equipment, Rental Audio System