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  • SMSL PA400 GaN HiFi Amplifier | 250W Stereo Class D Amp | XLR-Balanced, RCA, XLR-Mono Input | Home Audio Desktop Gallium Nitride Amps
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SMSL PA400 GaN HiFi Amplifier | 250W Stereo Class D Amp | XLR-Balanced, RCA, XLR-Mono Input | Home Audio Desktop Gallium Nitride Amps

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About this item

  • GaN Amplifier: Equipped with the latest GaN power transistors, the PA400 delivers pristine power, 250 W per channel into 4 Ω in stereo mode, and 500 W into 4 Ω in mono. effortlessly driving the vast majority of loudspeakers
  • Dual Operation Modes: Stereo balanced-input mode: when used with a pre-amplifier, the fully balanced topology reveals finer detail and a purer sonic texture. XLR mono-bridge mode: two PA400 units work in tandem, quadrupling output power, ideal for demanding loudspeakers while adding vocal warmth and greater body
  • XLR Mono Mode: With both units operating in tandem, background noise is further suppressed and soundstage depth, width and resolution are all enhanced. Whether powering floor-standers in a home-theater setup or hi-fi speakers in a personal listening room, the PA400 meets the acoustic demands of large spaces with ease
  • Comprehensive Connectivity: RCA, XLR and XLR-Mono inputs allow simple hook-up to any DAC’s RCA or XLR outputs, ensuring compatibility with virtually every DAC on the market and the faithful reproduction of clean, transparent audio
  • Premium Aluminum Construction: The chassis is milled from aerospace-grade aluminum on precision CNC machines, creating a unibody structure that is both ultra-rigid and an excellent heat sink. providing the stable, interference-free foundation required for true high-fidelity sound
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Product information

Technical Details

Brand ‎AOSHIDA
Manufacturer ‎SMSL
Place of Business ‎SMSL
Model ‎PA400
Part Number ‎PA400
Mounting Hardware ‎PA400 Amp, Power Cable, User Manual, SMSL Card
Number of Items ‎1
Batteries Required ‎No
Signal-to-noise ratio (dB) ‎115 dB
Manufacturer ‎SMSL
Item model number ‎PA400
Parcel Dimensions ‎25 x 25 x 5 cm; 2.5 kg
ASIN ‎B0FW3V7CY5

Additional Information

Date First Available Oct. 21 2025
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SMSL PA400 GaN HiFi Amplifier | 250W Stereo Class D Amp | XLR-Balanced, RCA, XLR-Mono Input | Home Audio Desktop Gallium Nitride Amps

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Product description



SMSL PA400 Amplifier Spec

🎵 Latest-generation GaN power devices switch at up to 1 MHz, rendering the entire audio band with finer micro-detail.

🎵 Precision level control is handled by the flagship PGA2311 volume IC for rock-solid channel matching and vanishingly low distortion.

🎵 Fully-balanced stereo input mode, when used with a pre-amp, delivers a more direct and pristine signal path.

🎵 XLR mono mode lets two units be bridged for a 4× power increase, effortlessly driving high-demand loudspeakers.

🎵 Audiophile-grade components are used throughout for enhanced subjective musicality.

🎵 High-quality gold-plated input and output terminals ensure long-term reliability and maximum conductivity.

🎵 Comprehensive protection circuitry guards against over-temperature, over-current and other fault conditions.

🎵 A purpose-designed, audio-specific switch-mode supply delivers >200 W of distortion-free power into both 8 Ω and 4 Ω loads.

Input：Balanced(XLR)/Line in(RCA)/Mono(XLR)
ձ+：0.003%
：115
Channel Separation：75dB
Input Sensitivitystereo：
Stereo：RCA 0.96Vrms/22kΩ ； XLR 2.1Vrms/22kΩ
Mono：XLR 2.7Vrms/22kΩ

Output Power：
Stereo：4Ω@ 250Wrms x2 ；8Ω@ 200Wrms x2
Mono：8Ω@ 500Wrms x1

Standby power <0.5W
Power Consumption：40W(Normal Volume)
：25447.7242(³)
±𾱲：2.58첵/5.69

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Product Summary: SMSL PA400 GaN HiFi Amplifier | 250W Stereo Class D Amp | XLR-Balanced, RCA, XLR-Mono Input | Home Audio Desktop Gallium Nitride Amps

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About this Item

  • GaN Amplifier: Equipped with the latest GaN power transistors, the PA400 delivers pristine power, 250 W per channel into 4 Ω in stereo mode, and 500 W into 4 Ω in mono. effortlessly driving the vast majority of loudspeakers
  • Dual Operation Modes: Stereo balanced-input mode: when used with a pre-amplifier, the fully balanced topology reveals finer detail and a purer sonic texture. XLR mono-bridge mode: two PA400 units work in tandem, quadrupling output power, ideal for demanding loudspeakers while adding vocal warmth and greater body
  • XLR Mono Mode: With both units operating in tandem, background noise is further suppressed and soundstage depth, width and resolution are all enhanced. Whether powering floor-standers in a home-theater setup or hi-fi speakers in a personal listening room, the PA400 meets the acoustic demands of large spaces with ease
  • Comprehensive Connectivity: RCA, XLR and XLR-Mono inputs allow simple hook-up to any DAC’s RCA or XLR outputs, ensuring compatibility with virtually every DAC on the market and the faithful reproduction of clean, transparent audio
  • Premium Aluminum Construction: The chassis is milled from aerospace-grade aluminum on precision CNC machines, creating a unibody structure that is both ultra-rigid and an excellent heat sink. providing the stable, interference-free foundation required for true high-fidelity sound

Product description

SMSL PA400 Amplifier Spec 🎵 Latest-generation GaN power devices switch at up to 1 MHz, rendering the entire audio band with finer micro-detail. 🎵 Precision level control is handled by the flagship PGA2311 volume IC for rock-solid channel matching and vanishingly low distortion. 🎵 Fully-balanced stereo input mode, when used with a pre-amp, delivers a more direct and pristine signal path. 🎵 XLR mono mode lets two units be bridged for a 4× power increase, effortlessly driving high-demand loudspeakers. 🎵 Audiophile-grade components are used throughout for enhanced subjective musicality. 🎵 High-quality gold-plated input and output terminals ensure long-term reliability and maximum conductivity. 🎵 Comprehensive protection circuitry guards against over-temperature, over-current and other fault conditions. 🎵 A purpose-designed, audio-specific switch-mode supply delivers >200 W of distortion-free power into both 8 Ω and 4 Ω loads. Input：Balanced(XLR)/Line in(RCA)/Mono(XLR) ձ+：0.003% ：115 Channel Separation：75dB Input Sensitivitystereo： Stereo：RCA 0.96Vrms/22kΩ ； XLR 2.1Vrms/22kΩ Mono：XLR 2.7Vrms/22kΩ Output Power： Stereo：4Ω@ 250Wrms x2 ；8Ω@ 200Wrms x2 Mono：8Ω@ 500Wrms x1 Standby power <0.5W Power Consumption：40W(Normal Volume) ：25447.7242(³) ±𾱲：2.58첵/5.69
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