SMSL PA400 Stereo / Mono Amplifier

The SMSL PA400 is an innovative amplifier that uses Gallium Nitride (GaN) transistors to deliver 2x250W amplification at 4Ω. Its versatility also allows it to operate in pure mono mode, delivering an impressive 500W at 8Ω. Each component of the PA400 has been meticulously selected to achieve exceptional audio performance, with an incredibly low harmonic distortion rate of 0.0003% and a signal-to-noise ratio of 115dB.

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462,50 € tax excl.
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Shipping date: 22-05-2026.

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2 Years warranty
 
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SMSL PA400 Stereo / Mono Amplifier Infineon GaN 2x250W 4 Ohm / 1x500W 8 Ohm

SMSL PA400 : Front view


The SMSL PA400 is an innovative amplifier that uses Gallium Nitride (GaN) transistors to deliver 2x250W amplification at 4Ω. Its versatility also allows it to operate in pure mono mode, delivering an impressive 500W at 8Ω. Each component of the PA400 has been meticulously selected to achieve exceptional audio performance, with an incredibly low harmonic distortion rate of 0.0003% and a signal-to-noise ratio of 115dB.

SMSL PA400: GaN transistors amplification

The PA400 uses GaN FET transistors for its amplification stage. These transistors offer significantly higher efficiency than traditional silicon transistors, minimising energy losses during switching and thus reducing heat generation. In addition, GaN transistors are distinguished by their extremely high switching speed, in the order of 1MHz. This increased speed has several notable advantages: it eliminates switching noise in the circuits, significantly reducing background noise, and it allows for much faster response times, instantly adapting to variations in power demand for greatly improved audio dynamics.

SMSL PA400 : difference entre transistor au silicium et à la nitrure de gallium

SMSL PA400: Optimised power supply

The PA400 incorporates a switching power supply stage specially designed for demanding audio applications. This power supply is capable of delivering considerable power while maintaining perfectly silent operation. For added safety, the PA400 is equipped with overheating and overpower protection circuits.

SMSL PA400 : Power supply
SMSL PA400 : Terminal blocks

SMSL PA400: Gold-plated output connectors

The PA400's output connectors are gold-plated to effectively protect them from oxidation and corrosion, while ensuring excellent electrical conductivity for optimal, loss-free audio signal transmission.

SMSL PA400 overview

SMSL PA400 : Product overview
1Control knob
2Power indicator light
3Remote control receiver
4Screen
5Right speaker output (stereo)
6Left speaker output (stereo)
7IEC socket
8Speaker output + (mode)
9Speaker output - (mode)
10Single-ended stereo RCA input
11Balanced stereo XLR input
12Mono XLR input

Technical characteristics

Specifications
Product typeIntegrated amplifier
Amplification componantInfineon GaN FET transistors
Inputs1x Single-ended stereo RCA
1x Balanced stereo XLR
1x Mono XLR
OutputSpeaker terminal
Total harmonic distortion more noise (THD+N)0.003%
Signal-to-noise ratio (SNR)115dB
Channel separation75dB
Input sensitivityRCA stéréo : 0.96Vrms/22kΩ
XLR stéréo : 2.1Vrms/22kΩ
XLR mono : 2.7Vrms/22kΩ
Stereo output power2x 250Wrms @ 4Ω
2x 200Wrms @ 8Ω
Mono output power1x 500Wrms @ 8Ω
Volume control chipPGA2311
General
Power supply100-240V AC
Energy consumptionStandby : < 0.5W
In use : 40W
Dimensions254 x 47.7 x 242mm
Weight2.58kg
ColorWhite
Package1x SMSL PA400
1x Remote control
1x Power cable
 
Data sheet
InputRCA
InputXLR
OutputSpeaker terminal
ColorWhite
Channel1 (Mono)
Channel2 (Stereo)
ClassN/A
Amplifier chipTransistors
Power (W)500.0
Power (W)250.0
Remote ControlYes
 
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Average votes
5.0 / 5
1 reviews
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 5/5
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Excellent ampli gallium PA 400 de Smsl...
Reçu très rapidement à domicile par La Poste...
Tout de suite essayé avec un Wiim Ultra en guise de pré-ampli accueillant aussi une clé usb de 32 Go à l'arrière pour lecture de fichiers musicaux grâce à l'appli Wiim Home ..
Leur lecteur de cd's Smsl PL 200 branché à l'arrière du Wiim Ultra permet également de lire des cd's avec une grande précision....
La dynamique et la clarté du Smsl PA 400 sont superbes....un vraiment bon ampli à la hauteur des espérances de cette nouvelle technologie GaN...il y a un bouton de volume bien pratique sur la télécommande, mais pas de réglage des aigues ou basses sur le PA 400 , ni sur le Wiim Ultra....pas trop grave parce que l'équilibre tonal est excellent avec les enceintes JBL monitors que j'utilise.
En résumé enchanté de l'achat de ce modèle , qui peut rivaliser en qualité d'écoute avec d'autres amplificateurs de grandes marques bien plus chers...
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This review has been posted for SMSL PA400 Stereo / Mono Amplifier Infineon GaN 2x250W 4 Ohm / 1x500W 8 Ohm
 
SMSL PA400 Stereo / Mono Amplifier Infineon GaN 2x250W 4 Ohm / 1x500W 8 Ohm
The SMSL PA400 is an innovative amplifier that uses Gallium Nitride (GaN) transistors to deliver 2x250W amplification at 4Ω. Its...

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