Soundmax SX-N500.4 amplifier 4 channel

Soundmax SX-N500.4 – 4-channel Class AB power amplifier 90W x4 @ 4 Ohm with warm sound character and stable control

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The Soundmax SX-N500.4 is a powerful and well-balanced 4-channel Class AB power amplifier, developed for those who appreciate a musical, clean and controlled reproduction. With 90W RMS per channel at 4 Ohm, it delivers stable power for front systems, rear speakers or active sets where sound quality and control are in focus.

At 2 Ohm, the power amplifier delivers 125W RMS per channel and can be bridged to 250W RMS x2 at 4 Ohm, which provides flexibility for different system solutions. The classic AB stage provides a warm and dynamic sound image with good detail reproduction across the entire frequency range 10–20,000 Hz – perfect for music listening where balance and precision are more important than extreme raw power.

The SX-N500.4 is equipped with both a high-pass filter (100–1,000 Hz) and a low-pass filter (40–400 Hz), making it easy to adapt the power amplifier to everything from speaker operation to simple active crossover. The high damping factor >170 contributes to good control over the elements, especially in the mid-bass range, and provides a tight and responsive sound.

With an operating voltage of 9–15 V and an input sensitivity of 0.2–6 V, the SX-N500.4 works smoothly with both original stereo and aftermarket units. A signal-to-noise ratio of 90 dB ensures a clean signal without interference, even at higher volumes.

The power amplifier has a robust chassis and measures 310 × 182 × 52 mm, which provides good cooling and stable operation even during longer gaming sessions. The Soundmax SX-N500.4 is an excellent choice for those who want classic Class AB sound, reliable power and high sound quality in a well-built and versatile 4-channel power amplifier.

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Technical data

• Number of channels 4 Channels
• Amplifier class Class AB
• Power into 2 ohms RMS 4x 125W
• Power into 4 ohms bridged RMS 2x 250W
• Power into 4 ohms RMS 4x 90W
• Frequency range 10 - 20,000 Hz
• High-pass filter 100 - 1,000 Hz
• Low-pass filter 40 - 400 Hz
• Damping factor >170
• Operating voltage 9 - 15 V
• Input sensitivity 0.2 - 6V
• Signal noise 90 dB
• Dimensions 310 x 182 x 52 mm