MTX THUNDER75.4 400W RMS 4-Channel Class A/B Amplifier

Feel the thunder. Hear every detail.

For more than two decades, MTX THUNDER amplifiers have been trusted for their raw power, precision engineering, and long-term reliability. The THUNDER75.4 continues that legacy with advanced Class A/B performance, delivering clean, dynamic sound that brings your system to life.

Producing up to 400 watts RMS across four channels, this amplifier delivers concert-level clarity with low distortion and strong control from deep bass to crisp highs. Its compact chassis makes installation easy, while premium internal components ensure consistent performance even under demanding conditions.

Built to push your system harder — without compromise.

Features

• 4-channel Class A/B amplifier

• Up to 400W RMS total power output

• Compact chassis for flexible installation

• Surface-mount PCB design for durability and vibration resistance

• Variable 12dB/Oct Butterworth crossovers for precise tuning

• Triple protection circuitry (thermal, DC offset, short circuit)

• Extruded aluminum heat sink for efficient cooling

• Low-noise internal design for clean, distortion-free sound

• MOSFET power supply for stable, efficient power delivery

Power Output

• 75W x 4 @ 4Ω

• 100W x 4 @ 2Ω

• 175W x 2 @ 4Ω (bridged)

Specifications

• Amplifier Type: 4-Channel Class A/B

• Signal-to-Noise Ratio: 80 dB

• Total Harmonic Distortion: < 1%

• Frequency Response: 15Hz – 25kHz

• Crossover: Variable HPF / LPF

  • Front: 10Hz – 200Hz

  • Rear: 50Hz – 750Hz

  • 12dB/Oct

• Input Sensitivity: 200mV – 5V

• Dimensions: 6.3″ (H) × 12.13″ (W) × 2.25″ (D)