SMSL PA-X: a GaN power amplifier using Infineon GaN FETs, rated at 250W x 2 into 4Ω, 200W x 2 into 8Ω, or 500W into 8Ω in mono mode. It's built to drive passive bookshelf and floorstanding speakers from a DAC or preamp, with a TI PGA2311 volume control and a remote.
Who the SMSL PA-X is for
Passive bookshelf and floorstanding speakers: SMSL rates it at 250W x 2 into 4Ω and 200W x 2 into 8Ω, and a load-type menu setting matches the amp to 4Ω or 8Ω speakers.
A DAC as the source: The TI PGA2311 volume chip and the remote's volume up/down give the PA-X its own volume control, and its RCA or balanced XLR inputs take a DAC's line output.
Systems that already have a preamp: A stereo pass-through mode lets it work as a pure power amplifier behind your existing preamp.
Planning a mono pair later: Switch to XLR mono mode and two units form a stereo pair, each rated 500W into 8Ω, for high-power-handling speakers.
Balanced or single-ended sources: Stereo XLR (2.1Vrms) and RCA (0.96Vrms) inputs, both 22kΩ, take balanced or single-ended DACs and preamps.
Skip it if: you need a DAC, Bluetooth or a phono input built in: the PA-X only takes analog XLR and RCA line inputs, so a separate DAC or preamp has to feed it.
SMSL PA-X key specs
Amplifier: Infineon GaN FETs, switching at up to 1MHz
Output power (stereo): 250W x 2 @ 4Ω; 200W x 2 @ 8Ω
Input sensitivity: RCA 0.96Vrms; XLR 2.1Vrms (2.7Vrms in mono); 22kΩ
Outputs: Gold-plated L/R speaker terminals (marked pair for mono mode)
Volume control: TI PGA2311; remote volume up/down and mute (RC-8A)
Power supply: Built-in switching supply, 100–240V AC; 40W at normal volume, <0.5W standby
Size and weight: 222.5 × 51 × 250mm (W × H × D); 2.57kg (5.67lb)
Genuine SMSL stock. Free shipping on every order, 45-day returns, 1-year warranty.
SMSL PA-X vs similar options
vs SMSL VMV A1 Pro: Smaller GaN sibling rated 160W x 2 into 4Ω (vs 250W x 2), and its XLR input is mono-mode only; pick the PA-X for more power or balanced stereo XLR.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
Choosing a selection results in a full page refresh.
