Soundmax SX-LX4125.4D amplifier 4 channel

Soundmax SX-LX4125.4D – 4-channel Class D power amplifier 125W x4 @ 4 Ohm with compact power and high flexibility

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The Soundmax SX-LX4125.4D is an efficient and versatile 4-channel Class D power amplifier, developed for those who want stable power, low heat generation and flexible use in a compact format. With 125W RMS per channel at 4 Ohm, it is ideal for driving front systems, rear speakers or smaller midbass with good control and clean reproduction.

The power amplifier delivers 125W RMS per channel even at 2 Ohm and can be bridged to provide up to 370W RMS x2 at 4 Ohm, making it easy to adapt to different system solutions. The wide frequency range from 10 to 45,000 Hz ensures high precision and detail across the entire register, regardless of whether the focus is on music listening or more pressure-oriented builds.

The SX-LX4125.4D is equipped with adjustable high-pass filters (50–500 Hz) and low-pass filters (50–250 Hz), which provides good control when active crossover. Thanks to the high-level input, the power amplifier can be easily integrated into the original stereo without additional accessories, and the wide input sensitivity of 0.25–8 V makes it compatible with both OEM and aftermarket units.

With a signal-to-noise ratio of 90 dB, the SX-LX4125.4D delivers a clean and stable sound without unnecessary interference. The efficient Class D design provides low power consumption and minimal heat generation, making the power amplifier a reliable choice even in tight installation spaces.

The Soundmax SX-LX4125.4D is an excellent choice for those looking for a compact format, flexible power and modern Class D efficiency - a power amplifier that works just as well in simple upgrades as in more thoughtful audio builds.

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Technical data

• Number of channels 4 Channels
• Amplifier class Class D
• Power into 2 ohms RMS 4x 190W
• Power into 4 ohms bridged RMS 2x 370W
• Power into 4 ohms RMS 4x 125W
• Frequency range 10 - 45,000 Hz
• High pass filter 50 - 500 Hz
• Low pass filter 50 - 250 Hz
• High level input Yes
• Input sensitivity 0.25 - 8V
• Signal noise 90 dB