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SMSL PA-X Gallium Nitride Power Amplifier

Sale price$699.00 USD

A smarter way to power your speakers

The SMSL PA-X isn’t flashy. It’s not oversized. And it doesn’t try to be anything other than what it is—a lean, high-performance power amplifier built around next-gen Gallium Nitride transistors. With ultra-low distortion (0.003% THD+N), 115dB signal-to-noise ratio, stereo and mono modes, and over 500W of output in mono, it’s as clean and powerful as anything in its class. Built for transparency, reliability, and simplicity, the PA-X is a solid choice for audiophiles looking to drive passive speakers without the noise, bulk, or fanfare.

Gallium Nitride power, made practical

The PA-X uses a new Infineon GaN (Gallium Nitride) power transistor—an upgrade over traditional silicon FETs. With switching frequencies up to 1MHz, this design improves clarity, speed, and bandwidth, especially across high and mid frequencies. It’s a smart way to reduce distortion while preserving dynamic range, without relying on bulky heat sinks or exotic circuitry.

Mono mode for more muscle

Running a single PA-X in stereo gives you 200W into 8Ω and 250W into 4Ω. But if you’re running demanding speakers—or just want more power—you can switch into mono mode. With XLR mono input engaged, the amp outputs 500W into 8Ω. Perfect for towers, subs, or big 2-channel systems where a pair of mono blocks makes more sense.

Designed for daily driving

High-end internals don’t mean high maintenance. The PA-X uses a custom high-power switching supply that’s designed specifically for audio—not just adapted from industrial power designs. Overcurrent and overheating protections keep things running smoothly even during long sessions, and standby power usage stays under 0.5W.

Clean signal in, clean signal out

Gold-plated RCA and XLR inputs ensure strong, low-resistance connections to your DAC or preamp. A front-mounted volume knob and screen make it easy to check your level at a glance, while the included remote lets you manage playback from your couch.

Product highlights

  • Gallium Nitride power transistor (Infineon)
  • Up to 1MHz switching frequency
  • 115dB SNR
  • Ultra-low THD+N of 0.003%
  • Stereo and mono modes
  • RCA, balanced XLR, and mono XLR inputs
  • Custom high-power switching supply for audio
  • Gold-plated input and output terminals
  • Overcurrent and overheating protection circuits
  • 250W x2 @ 4Ω / 200W x2 @ 8Ω (stereo)
  • 500W x1 @ 8Ω (mono)
  • Remote control included

Specs

  • Inputs: Balanced (XLR) / Line in (RCA) / Mono (XLR)
  • THD+N: 0.003%
  • SNR: 115dB
  • Channel separation: 75dB
  • Input sensitivity:
    • RCA: 0.96Vrms / 22kΩ
    • XLR: 2.1Vrms / 22kΩ
    • Mono XLR: 2.7Vrms / 22kΩ
  • Output power:
    • Stereo 4Ω: 250Wrms x2
    • Stereo 8Ω: 200Wrms x2
    • Mono 8Ω: 500Wrms x1
  • Standby power: <0.5W
  • Power consumption: 40W (at normal volume)
  • Dimensions: 8.8in x 2in x 9.8in (222.5mm x 51mm x 250mm)
  • Weight: 5.67lbs (2.57kg)

What’s included

  • SMSL PA-X amplifier
  • Remote control
  • Power cord
  • User manual
SMSL PA-X Gallium Nitride Power Amplifier
SMSL PA-X Gallium Nitride Power Amplifier Sale price$699.00 USD

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