SMSL PA400 Digital Power Amplifier with Infineon MA5332, Tone Control, and Built-In Power Supply

Regular price: $4,438.55
Regular price
Sale price: $4,438.55

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Product Highlights

Infineon MA5332 Class D amplifier chip for high-efficiency power delivery

165W x 2 output into 4 Ohm with low distortion and wide dynamic range

NJU7391A volume control with surround sound and tone processing

Built-in power supply eliminates external adapters and cable clutter

Independent bass and treble adjustment for room and speaker matching

Gold-plated RCA inputs and speaker terminals for reliable connectivity

Full-function remote control for power, volume, and settings adjustment

Compact chassis measuring just 191.6 x 41.6 x 185 mm and weighing 1.26 kg

High-Efficiency Class D Power with Tone Control

The SMSL PA400 is a high-output Gallium Nitride (GaN) power amplifier that combines Infineon's cutting-edge GaN transistor technology with a 1 MHz ultra-high switching frequency to deliver up to 165 watts per channel of clean, dynamic power. With fully-balanced XLR inputs, a built-in high-performance power supply, and comprehensive bass and treble tone controls, the PA400 drives even the most demanding floorstanding speakers with effortless authority, vanishingly low distortion, and a noise floor that disappears into absolute silence.

Infineon GaN Technology with 1 MHz Switching

The PA400 is built around Infineon's latest-generation Gallium Nitride power transistors, which switch up to four times faster than conventional silicon devices. This 1 MHz switching frequency dramatically reduces dead time, eliminates crossover distortion artifacts, and enables the amplifier to track transient signals with razor-sharp precision. The audible result is tighter bass, more articulate midrange detail, and airy, extended treble free from the grain and haze that plague lesser Class D designs.

165W x 2 of Clean Class D Power

With 400 watts per channel on tap, the PA400 effortlessly drives power-hungry floorstanding speakers, large bookshelf monitors, and low-sensitivity audiophile designs that would challenge lesser amplifiers. Headroom is abundant — dynamic peaks explode with impact while quiet passages retain their nuance and micro-detail.

Fully-Balanced XLR Input Stage

True differential XLR inputs reject common-mode noise and ground-loop hum at the point of entry, preserving the full signal-to-noise ratio of your source components. Combined with high-quality RCA inputs for single-ended sources, the PA400 integrates seamlessly into both professional studio environments and high-end consumer audio systems.

Built-In High-Performance Power Supply

Unlike many power amplifiers that require bulky external power bricks, the PA400 integrates a substantial internal power supply designed specifically for the dynamic current demands of high-output amplification. This keeps your rack clean while ensuring the amplifier has instant access to the energy reserves required for explosive transients and deep bass passages.

Bass and Treble Tone Controls

Independent bass and treble adjustment lets you fine-tune the tonal balance to match your room acoustics, speaker characteristics, and personal preference. Bypass them entirely for a pure direct signal path, or engage them for subtle corrections.

Precision Volume Control and OLED Display

A high-resolution digital volume control provides precise, repeatable level adjustment with perfect channel tracking at any volume setting. The bright OLED display shows input selection, volume level, and operating status at a glance.

Specifications