{"product_id":"apos-certified-smsl-pa400-gallium-nitride-power-amplifier","title":"SMSL PA400 Gallium Nitride Power Amplifier (Apos Certified)","description":"\u003ch1\u003e\u003cstrong\u003eSMSL PA400 Gallium Nitride Power Amplifier\u003c\/strong\u003e\u003c\/h1\u003e\n \u003cp\u003eThe SMSL PA400 GaN Power Amplifier delivers a rare mix of muscle and nuance. Built around gallium nitride (GaN) power transistors from Infineon, it pushes 600W of clean power while keeping distortion at a mere 0.003%. Pair it with your favorite DAC or preamp and you get detail, control, and effortless dynamics across any speaker system.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eThe latest gallium nitride power stage\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eAt the heart of the PA400 is Infineon’s GaN power transistor, operating at an ultra-high 1MHz switching frequency. That’s fast enough to keep transients crisp and controlled while preserving low-level detail. The result is full-band precision: bass that feels taught, mids that sound uncolored, and treble that stays smooth even at high volume. With a THD+N of just 0.003% and SNR of 115dB, you’ll hear silence where there should be silence and texture when the music calls for it.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eTwo modes, two moods\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe PA400 can run in stereo balanced mode or XLR mono bridge mode, giving you flexibility depending on your system and space. In stereo, it’s clean, open, and faithful—ideal for reference listening. In mono, two units can work together to quadruple output power, driving demanding floor-standing speakers or large studio monitors with ease. Either way, its linear response and low noise floor keep the signal pure and consistent.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eDesigned to stay cool and quiet\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe PA400’s chassis is carved from aerospace-grade aluminum alloy with precision CNC machining. Those sculpted fins on the side enhance passive heat dissipation, keeping the amp cool even when the evening gets away from you. \u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eBuilt to last, built to please\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eEvery detail of the PA400 reflects careful craftsmanship, from the finely-milled control knob that turns with buttery-smooth resistance to the soft rubber feet that absorb vibration and keep the amp stable on your desk or rack. Inside, audiophile-grade components and a dedicated 600W switching power supply deliver stable current to your speakers. Protection circuits guard against overheating and overcurrent, so it performs day in, day out.\u003cbr\u003e\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eSeamless integration\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h2\u003e\n \u003cp\u003eConnecting your system is straightforward. XLR and RCA inputs give you options whether you’re pairing it with a balanced DAC or a vintage line source. Gold-plated binding posts ensure zero-loss signal transfer, and the labeled rear panel makes stereo and bridged configurations clear at a glance. Whether your system includes an SMSL D400 PRO DAC, PL200T CD player, or any high-end preamp, the PA400 plays nicely with all of them.\u003cbr\u003e\u003c\/p\u003e\n \u003ch3\u003e\n \u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h3\u003e\n \u003cul\u003e\n \u003cli\u003eGaN power transistors from Infineon\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eUltra-low 0.003% THD+N and 115dB SNR\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eStereo balanced and mono bridged modes\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003e600W continuous output at 8Ω\/4Ω\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eAerospace-grade aluminum chassis with passive cooling\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eGold-plated input and output terminals\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eAudiophile-grade internal components\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eOverheating and overcurrent protection\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eXLR and RCA inputs for flexible connectivity\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003ePrecision-milled control knob and vibration-damping rubber feet\u003cbr\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3\u003e\n \u003cstrong\u003eSpecs\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h3\u003e\n \u003cul\u003e\n \u003cli\u003eInput: Balanced (XLR) \/ Line in (RCA) \/ Mono (XLR)\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eTHD+N: 0.003%\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eSNR: 115dB\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eChannel separation: 75dB\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eInput sensitivity (stereo):\u003cbr\u003e\n \u003cul\u003e\n \u003cli\u003eRCA: 0.96Vrms \/ 22kΩ\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eXLR: 2.1Vrms \/ 22kΩ\u003cbr\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eInput sensitivity (mono):\u003cbr\u003e\n \u003cul\u003e\n \u003cli\u003eXLR: 2.7Vrms \/ 22kΩ\u003cbr\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eOutput power (stereo):\u003cbr\u003e\n \u003cul\u003e\n \u003cli\u003e4Ω: 250Wrms ×2\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003e8Ω: 200Wrms ×2\u003cbr\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eOutput power (mono):\u003cbr\u003e\n \u003cul\u003e\n \u003cli\u003e8Ω: 500Wrms ×1\u003cbr\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003eStandby power: \u0026lt;0.5W\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003ePower consumption: 40W (normal volume)\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eDimensions: 10in × 1.88in × 9.53in (254 × 47.7 × 242mm)\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eWeight: 5.69lbs (2.58kg)\u003cbr\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3\u003e\n \u003cstrong\u003eWhat’s included\u003c\/strong\u003e\u003cbr\u003e\n \u003c\/h3\u003e\n \u003cul\u003e\n \u003cli\u003eSMSL PA400 GaN Power Amplifier\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003ePower cable\u003cbr\u003e\n \u003c\/li\u003e\n \u003cli\u003eUser manual\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003cp\u003e \u003c\/p\u003e","brand":"SMSL","offers":[{"title":"Open Box - Like New","offer_id":46866167988399,"sku":"APS-AC-1136-1-LN","price":439.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6415\/2239\/files\/apos-audio-smsl-speaker-amp-smsl-pa400-gallium-nitride-power-amplifier-apos-certified-open-box-like-new-1217025403.jpg?v=1777716023","url":"https:\/\/freshized.com\/products\/apos-certified-smsl-pa400-gallium-nitride-power-amplifier","provider":"Freshized","version":"1.0","type":"link"}