{"product_id":"smsl-pa400","title":"SMSL PA400|GaN 500W|Infineon GaN FET \u0026 TI PGA2311|Hi-Fi Stereo Amplifier","description":"\u003c!-- SMSL PA400 PREMIUM BLACK \u0026 GOLD INTEGRATED DESCRIPTION --\u003e\n\u003cdiv class=\"pa400-premium-description\" style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; color: #2c2c2c; line-height: 1.7; max-width: 800px; margin: 0 auto; padding: 20px 0;\"\u003e\n\u003c!-- 1. Header \u0026 Title Section --\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 45px;\"\u003e\n\u003cspan style=\"font-size: 11px; font-weight: bold; color: #b89775; letter-spacing: 2px; text-transform: uppercase;\"\u003eAbsolute Power, Purest Control\u003c\/span\u003e\n\u003ch2 style=\"font-size: 28px; font-weight: 500; color: #111; letter-spacing: 0.5px; margin-top: 8px; margin-bottom: 12px; font-family: inherit;\"\u003eSMSL PA400 GaN 500W Hi-Fi Stereo Amplifier\u003c\/h2\u003e\n\u003cp style=\"font-size: 15px; color: #666; max-width: 650px; margin: 0 auto; font-family: inherit;\"\u003eUncompromising acoustic drive. Engineered with German Infineon GaN FET transistors, TI PGA2311 precision volume control, and BTL bridging for up to 500W of clean mono power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- 2. Re-designed Premium 6-Point Highlights Grid (Luxury Black \u0026 Gold SVG Icons) --\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: 600; color: #111; border-bottom: 1px solid #eee; padding-bottom: 8px; margin-top: 40px; margin-bottom: 25px; text-transform: uppercase; letter-spacing: 0.5px; font-family: inherit;\"\u003eSix Core Pillars of Sound\u003c\/h3\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 15px; justify-content: space-between; margin-bottom: 40px;\"\u003e\n\u003c!-- Card 1 (GaN FET Transistor SVG) --\u003e\n\u003cdiv style=\"flex: 1 1 calc(33.33% - 10px); min-width: 240px; box-sizing: border-box; background-color: #fff; padding: 24px; border-radius: 8px; border: 1px solid #eaeaea;\"\u003e\n\u003cdiv style=\"width: 44px; height: 44px; background-color: #111111; border: 1px solid #b89775; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-bottom: 20px;\"\u003e\u003csvg width=\"22\" height=\"22\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#b89775\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\n                    \u003crect x=\"4\" y=\"4\" width=\"16\" height=\"16\" rx=\"2\"\u003e\u003c\/rect\u003e\n                    \u003cpath d=\"M12 2v2M12 20v2M2 12h2M20 12h2\"\u003e\u003c\/path\u003e\n                    \u003ccircle cx=\"12\" cy=\"12\" r=\"3\"\u003e\u003c\/circle\u003e\n                \u003c\/svg\u003e\u003c\/div\u003e\n\u003ch4 style=\"margin: 0 0 8px 0; font-size: 14px; font-weight: 600; color: #111; font-family: inherit;\"\u003eInfineon GaN FETs\u003c\/h4\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.6; font-family: inherit;\"\u003eIncorporates Infineon's latest GaN transistors with a 1MHz switching speed for delicate high frequencies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Card 2 (PGA2311 Volume Dial SVG) --\u003e\n\u003cdiv style=\"flex: 1 1 calc(33.33% - 10px); min-width: 240px; box-sizing: border-box; background-color: #fff; padding: 24px; border-radius: 8px; border: 1px solid #eaeaea;\"\u003e\n\u003cdiv style=\"width: 44px; height: 44px; background-color: #111111; border: 1px solid #b89775; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-bottom: 20px;\"\u003e\u003csvg width=\"22\" height=\"22\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#b89775\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\n                    \u003ccircle cx=\"12\" cy=\"12\" r=\"9\"\u003e\u003c\/circle\u003e\n                    \u003ccircle cx=\"12\" cy=\"12\" r=\"3\"\u003e\u003c\/circle\u003e\n                    \u003cline x1=\"12\" y1=\"3\" x2=\"12\" y2=\"9\"\u003e\u003c\/line\u003e\n                \u003c\/svg\u003e\u003c\/div\u003e\n\u003ch4 style=\"margin: 0 0 8px 0; font-size: 14px; font-weight: 600; color: #111; font-family: inherit;\"\u003eTI PGA2311 Control\u003c\/h4\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.6; font-family: inherit;\"\u003eUtilizes TI's advanced volume control chip for exceptionally precise level steps and zero analog mismatch.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Card 3 (BTL Bridging Stack SVG) --\u003e\n\u003cdiv style=\"flex: 1 1 calc(33.33% - 10px); min-width: 240px; box-sizing: border-box; background-color: #fff; padding: 24px; border-radius: 8px; border: 1px solid #eaeaea;\"\u003e\n\u003cdiv style=\"width: 44px; height: 44px; background-color: #111111; border: 1px solid #b89775; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-bottom: 20px;\"\u003e\u003csvg width=\"22\" height=\"22\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#b89775\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\n                    \u003cpath d=\"M12 2L2 7l10 5 10-5-10-5zM2 17l10 5 10-5M2 12l10 5 10-5\"\u003e\u003c\/path\u003e\n                \u003c\/svg\u003e\u003c\/div\u003e\n\u003ch4 style=\"margin: 0 0 8px 0; font-size: 14px; font-weight: 600; color: #111; font-family: inherit;\"\u003e500W Mono Bridging\u003c\/h4\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.6; font-family: inherit;\"\u003eSupports BTL mono mode. Couple two PA400 units to deliver a massive 500W @ 8Ω per channel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Card 4 (Low Noise GaN Power Supply SVG) --\u003e\n\u003cdiv style=\"flex: 1 1 calc(33.33% - 10px); min-width: 240px; box-sizing: border-box; background-color: #fff; padding: 24px; border-radius: 8px; border: 1px solid #eaeaea;\"\u003e\n\u003cdiv style=\"width: 44px; height: 44px; background-color: #111111; border: 1px solid #b89775; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-bottom: 20px;\"\u003e\u003csvg width=\"22\" height=\"22\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#b89775\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\n                    \u003cpath d=\"M13 2L3 14h9l-1 8 10-12h-9l1-8z\"\u003e\u003c\/path\u003e\n                \u003c\/svg\u003e\u003c\/div\u003e\n\u003ch4 style=\"margin: 0 0 8px 0; font-size: 14px; font-weight: 600; color: #111; font-family: inherit;\"\u003eDedicated GaN Power\u003c\/h4\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.6; font-family: inherit;\"\u003eEquipped with a built-in low-noise GaN switching power supply, providing high efficiency and stable current.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Card 5 (Bypass \/ Pass-Through SVG) --\u003e\n\u003cdiv style=\"flex: 1 1 calc(33.33% - 10px); min-width: 240px; box-sizing: border-box; background-color: #fff; padding: 24px; border-radius: 8px; border: 1px solid #eaeaea;\"\u003e\n\u003cdiv style=\"width: 44px; height: 44px; background-color: #111111; border: 1px solid #b89775; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-bottom: 20px;\"\u003e\u003csvg width=\"22\" height=\"22\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#b89775\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\n                    \u003cpath d=\"M2 12h20M12 5l7 7-7 7\"\u003e\u003c\/path\u003e\n                \u003c\/svg\u003e\u003c\/div\u003e\n\u003ch4 style=\"margin: 0 0 8px 0; font-size: 14px; font-weight: 600; color: #111; font-family: inherit;\"\u003ePure Amp Pass-Through\u003c\/h4\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.6; font-family: inherit;\"\u003eFeatures a straight pass-through mode, bypassing the internal preamp stage for pure power amplification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Card 6 (Chassis Frame SVG) --\u003e\n\u003cdiv style=\"flex: 1 1 calc(33.33% - 10px); min-width: 240px; box-sizing: border-box; background-color: #fff; padding: 24px; border-radius: 8px; border: 1px solid #eaeaea;\"\u003e\n\u003cdiv style=\"width: 44px; height: 44px; background-color: #111111; border: 1px solid #b89775; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-bottom: 20px;\"\u003e\u003csvg width=\"22\" height=\"22\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#b89775\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\n                    \u003crect x=\"3\" y=\"3\" width=\"18\" height=\"18\" rx=\"2\"\u003e\u003c\/rect\u003e\n                    \u003cpath d=\"M9 21V9a3 3 0 0 1 6 0v12\"\u003e\u003c\/path\u003e\n                \u003c\/svg\u003e\u003c\/div\u003e\n\u003ch4 style=\"margin: 0 0 8px 0; font-size: 14px; font-weight: 600; color: #111; font-family: inherit;\"\u003eCNC Shielded Case\u003c\/h4\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.6; font-family: inherit;\"\u003eAnodized all-aluminum chassis machined via CNC, providing structural isolation and gold-plated terminals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- 3. Core Text Copy Block (SEO Optimized \u0026 Sensory Focus) --\u003e\n\u003cdiv style=\"margin-bottom: 35px;\"\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: 600; color: #111; border-bottom: 1px solid #eee; padding-bottom: 8px; margin-bottom: 12px; font-family: inherit;\"\u003eThe Speed of Light: Infineon GaN Power Stages\u003c\/h3\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 15px; color: #444; font-family: inherit;\"\u003eSpeed translates directly into transparency. The \u003cstrong\u003eSMSL PA400 stereo power amplifier\u003c\/strong\u003e implements German Infineon's latest Gallium Nitride (GaN) power transistors. Operating at an ultra-high switching frequency of up to 1MHz, these components process signals with exceptional rise time. By virtually eliminating traditional class-D high-frequency switching hash, the PA400 delivers a smooth, delicate, and resolving top-end reminiscent of fine class-AB designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 35px;\"\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: 600; color: #111; border-bottom: 1px solid #eee; padding-bottom: 8px; margin-bottom: 12px; font-family: inherit;\"\u003eTI PGA2311 Reference-Grade Level Attenuation\u003c\/h3\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 15px; color: #444; font-family: inherit;\"\u003ePreserve every decibel of dynamic range. The PA400 employs Texas Instruments' advanced \u003cstrong\u003ePGA2311\u003c\/strong\u003e volume control chip, enabling high-precision stepped level attenuation with zero channel drift or analog wear. Unlike standard carbon potentiometers that degrade over time, the PGA2311 maintains strict channel tracking, ensuring a stable, centered stereo image even at whisper-quiet late-night listening levels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 35px;\"\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: 600; color: #111; border-bottom: 1px solid #eee; padding-bottom: 8px; margin-bottom: 12px; font-family: inherit;\"\u003eStructural CNC Isolation and Gold-Plated Interconnects\u003c\/h3\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 15px; color: #444; font-family: inherit;\"\u003ePrecision construction defines the VMV chassis language. Milled from a single block of aerospace-grade aluminum and finished with refined anodization, the enclosure provides passive thermal dissipation and excellent electromagnetic shielding. On the rear panel, custom heavy-duty gold-plated XLR inputs and high-current speaker binding posts protect signal integrity, securing a solid, lossless connection to your speakers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- 4. NEW SECTION: Acoustic Topology Matrix (Interactive-style board layout) --\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: 600; color: #111; border-bottom: 1px solid #eee; padding-bottom: 8px; margin-top: 40px; margin-bottom: 25px; text-transform: uppercase; letter-spacing: 0.5px; font-family: inherit;\"\u003eAcoustic Topology Matrix\u003c\/h3\u003e\n\u003cp style=\"font-size: 14px; color: #444; margin-bottom: 20px;\"\u003eThe SMSL PA400 functions adaptively, offering three distinct system topologies to match different acoustic speaker loads and system setups:\u003c\/p\u003e\n\u003cdiv style=\"border: 1px solid #eee; border-radius: 8px; padding: 24px; background-color: #fafafa; margin-bottom: 40px;\"\u003e\n\u003c!-- Matrix 1 --\u003e\n\u003cdiv style=\"margin-bottom: 20px; padding-bottom: 15px; border-bottom: 1px dashed #e5e5e5;\"\u003e\n\u003cdiv style=\"display: flex; justify-content: space-between; font-size: 13.5px; font-weight: 600; color: #111; margin-bottom: 6px;\"\u003e\n\u003cspan\u003eStereo Mode - 250W x 2\u003c\/span\u003e \u003cspan style=\"color: #b89775; font-size: 12px; font-weight: bold;\"\u003eSTANDARD HIGH-FIDELITY\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.5;\"\u003eDelivers up to 250W x 2 RMS into 4Ω (200W x 2 into 8Ω), driving standard high-fidelity bookshelf or floorstanding speakers with absolute grip and low distortion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Matrix 2 --\u003e\n\u003cdiv style=\"margin-bottom: 20px; padding-bottom: 15px; border-bottom: 1px dashed #e5e5e5;\"\u003e\n\u003cdiv style=\"display: flex; justify-content: space-between; font-size: 13.5px; font-weight: 600; color: #111; margin-bottom: 6px;\"\u003e\n\u003cspan\u003ePure Amp Mono Mode - 500W x 1\u003c\/span\u003e \u003cspan style=\"color: #b89775; font-size: 12px; font-weight: bold;\"\u003eMASSIVE DUAL-MONO STACK\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.5;\"\u003eBridge two PA400 units using BTL mono mode. Each unit delivers a massive 500W of power into an 8-ohm load, perfect for driving hard-to-tame tower speakers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Matrix 3 --\u003e\n\u003cdiv\u003e\n\u003cdiv style=\"display: flex; justify-content: space-between; font-size: 13.5px; font-weight: 600; color: #111; margin-bottom: 6px;\"\u003e\n\u003cspan\u003eLoad Impedance Adaptation - 4Ω \/ 8Ω\u003c\/span\u003e \u003cspan style=\"color: #b89775; font-size: 12px; font-weight: bold;\"\u003eTHERMAL COMPENSATED\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.5;\"\u003eSelect between 4-ohm and 8-ohm load modes in the menu. This optimizes current output delivery and safety circuits to ensure thermal stability under sustained loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- 5. Accordion FAQs Section (5 Detailed Items) --\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: 600; color: #111; border-bottom: 1px solid #eee; padding-bottom: 8px; margin-top: 40px; margin-bottom: 20px; text-transform: uppercase; letter-spacing: 0.5px; font-family: inherit;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom: 40px;\"\u003e\n\u003cdetails style=\"border-bottom: 1px solid #eaeaea; padding: 15px 0; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 14.5px; font-weight: 600; color: #111; list-style: none; display: flex; justify-content: space-between; align-items: center; font-family: inherit;\"\u003eWhat is the advantage of the Infineon GaN FET transistors? \u003cspan style=\"font-size: 16px; color: #888;\"\u003e+\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp style=\"margin: 10px 0 0 0; font-size: 13.5px; color: #555; line-height: 1.6; padding-right: 20px; font-family: inherit;\"\u003eUnlike standard silicon transistors, Gallium Nitride (GaN) switches at a much faster speed (up to 1MHz) with lower power loss. This drastically minimizes high-frequency distortion, delivering clear, natural treble extension and resolving high-resolution details without the harshness often associated with standard class-D amplifiers.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border-bottom: 1px solid #eaeaea; padding: 15px 0; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 14.5px; font-weight: 600; color: #111; list-style: none; display: flex; justify-content: space-between; align-items: center; font-family: inherit;\"\u003eHow do I set up BTL Mono Bridging mode? \u003cspan style=\"font-size: 16px; color: #888;\"\u003e+\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp style=\"margin: 10px 0 0 0; font-size: 13.5px; color: #555; line-height: 1.6; padding-right: 20px; font-family: inherit;\"\u003eIn the menu settings, switch the AMP MODE to \"PURE AMP MONO\". Connect your preamplifier output using the Left channel XLR input of the PA400, and connect your speaker cable according to the MONO (+ and -) labels on the rear binding posts. You will need two PA400 units to form a stereo dual-mono setup.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border-bottom: 1px solid #eaeaea; padding: 15px 0; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 14.5px; font-weight: 600; color: #111; list-style: none; display: flex; justify-content: space-between; align-items: center; font-family: inherit;\"\u003eCan I use the PA400 as a pure power amplifier? \u003cspan style=\"font-size: 16px; color: #888;\"\u003e+\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp style=\"margin: 10px 0 0 0; font-size: 13.5px; color: #555; line-height: 1.6; padding-right: 20px; font-family: inherit;\"\u003eYes, indeed. The PA400 features a dedicated pass-through mode in its amp settings. Connecting it to a high-quality external pre-amplifier bypasses the internal volume control stage entirely, converting the PA400 into a pure stereo power amplifier.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border-bottom: 1px solid #eaeaea; padding: 15px 0; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 14.5px; font-weight: 600; color: #111; list-style: none; display: flex; justify-content: space-between; align-items: center; font-family: inherit;\"\u003eWhy does the volume control utilize the TI PGA2311 chip? \u003cspan style=\"font-size: 16px; color: #888;\"\u003e+\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp style=\"margin: 10px 0 0 0; font-size: 13.5px; color: #555; line-height: 1.6; padding-right: 20px; font-family: inherit;\"\u003eTraditional analog potentiometers degrade over time, leading to static noise and channel imbalances (one speaker sounding louder than the other) at low volume levels. The TI PGA2311 is an electronic stepped level control chip that keeps channel matching perfect and preserves full dynamic range across all volume steps.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border-bottom: 1px solid #eaeaea; padding: 15px 0; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 14.5px; font-weight: 600; color: #111; list-style: none; display: flex; justify-content: space-between; align-items: center; font-family: inherit;\"\u003eWhat does the \"Load Type\" setting do? \u003cspan style=\"font-size: 16px; color: #888;\"\u003e+\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp style=\"margin: 10px 0 0 0; font-size: 13.5px; color: #555; line-height: 1.6; padding-right: 20px; font-family: inherit;\"\u003eThe LOAD TYPE menu (4Ω or 8Ω) adjusts the amplifier's internal protection circuits and current limitation parameters to match the nominal impedance of your speakers. This ensures optimal power transfer efficiency and keeps the amplifier cool under sustained listening sessions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c!-- 6. Technical Specifications Table --\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: 600; color: #111; border-bottom: 1px solid #eee; padding-bottom: 8px; margin-top: 40px; margin-bottom: 15px; text-transform: uppercase; letter-spacing: 0.5px; font-family: inherit;\"\u003eSMSL PA400 Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 13.5px; color: #333; text-align: left; background-color: #fafafa; border: 1px solid #eee; margin-bottom: 30px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f1f1f1; border-bottom: 1px solid #ddd;\"\u003e\n\u003cth style=\"padding: 12px; font-weight: 600; width: 35%; font-family: inherit;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"padding: 12px; font-weight: 600; font-family: inherit;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; background-color: #fff; font-family: inherit;\"\u003eInputs\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; background-color: #fff; font-family: inherit;\"\u003eBalanced (XLR) \/ RCA Unbalanced \/ Mono (XLR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; font-family: inherit;\"\u003eOutputs\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; font-family: inherit;\"\u003eHigh-current Speaker Binding Posts (Stereo \/ Mono BTL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; background-color: #fff; font-family: inherit;\"\u003eTHD+N\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; background-color: #fff; font-family: inherit;\"\u003e0.003%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; font-family: inherit;\"\u003eSignal-to-Noise Ratio (SNR)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; font-family: inherit;\"\u003e115dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; background-color: #fff; font-family: inherit;\"\u003eChannel Separation\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; background-color: #fff; font-family: inherit;\"\u003e75dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; vertical-align: top; font-family: inherit;\"\u003eInput Sensitivity\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; font-family: inherit;\"\u003eRCA (Stereo): 0.96Vrms \/ 22kΩ\u003cbr\u003eXLR (Stereo): 2.1Vrms \/ 22kΩ\u003cbr\u003eXLR (Mono): 2.7Vrms \/ 22kΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; vertical-align: top; background-color: #fff; font-family: inherit;\"\u003ePower Output (Stereo Mode)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; background-color: #fff; font-family: inherit;\"\u003e4Ω: 250W x 2 RMS\u003cbr\u003e8Ω: 200W x 2 RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; vertical-align: top; font-family: inherit;\"\u003ePower Output (Mono Bridged Mode)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; font-family: inherit;\"\u003e8Ω: 500W x 1 RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; background-color: #fff; font-family: inherit;\"\u003ePower Consumption\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; background-color: #fff; font-family: inherit;\"\u003e40W (At standard listening volume)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; font-family: inherit;\"\u003eStandby Power\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; font-family: inherit;\"\u003e\u0026lt;0.5W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 12px; font-weight: 500; background-color: #fff; font-family: inherit;\"\u003eDimensions \u0026amp; Weight\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; background-color: #fff; font-family: inherit;\"\u003e254 x 47.7 x 242 mm (WxHxD) | 2.58kg (5.69lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- 7. What's in the Box Card (Placed AFTER the specs table) --\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: 600; color: #111; border-bottom: 1px solid #eee; padding-bottom: 8px; margin-top: 40px; margin-bottom: 20px; text-transform: uppercase; letter-spacing: 0.5px; font-family: inherit;\"\u003eIn the Box\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fafafa; border: 1px solid #eaeaea; border-radius: 4px; padding: 24px; margin-bottom: 40px;\"\u003e\n\u003cp style=\"margin: 0 0 15px 0; font-size: 13.5px; color: #555; line-height: 1.6; font-family: inherit;\"\u003eEvery SMSL PA400 package includes a comprehensive set of accessories, allowing you to connect and synchronize your system components immediately:\u003c\/p\u003e\n\u003cul style=\"margin: 0; padding-left: 20px; font-size: 13.5px; color: #111; line-height: 2; font-family: inherit;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eSMSL PA400\u003c\/strong\u003e Stereo \/ Mono Power Amplifier\u003c\/li\u003e\n\u003cli\u003eFull-Function Remote Control (RC-8A)\u003c\/li\u003e\n\u003cli\u003eAC Power Supply Cable (Matched to destination country)\u003c\/li\u003e\n\u003cli\u003eUser Manual \/ Guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- SMSL PA400 PREMIUM BLACK \u0026 GOLD INTEGRATED DESCRIPTION END --\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- SMSL PA200 vs PA400 Reference GaN Amplifier Comparison Guide --\u003e\n\u003cdiv class=\"gan-amp-comparison\" style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; color: #2c2c2c; line-height: 1.7; max-width: 800px; margin: 0 auto; padding: 20px 0;\"\u003e\n\u003c!-- 1. Section Header --\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 45px;\"\u003e\n\u003cspan style=\"font-size: 11px; font-weight: bold; color: #b89775; letter-spacing: 2px; text-transform: uppercase; display: block; margin-bottom: 10px;\"\u003eAcoustic Comparison Guide\u003c\/span\u003e\n\u003ch2 style=\"font-size: 26px; font-weight: 500; color: #111; letter-spacing: 0.5px; margin: 0 0 12px 0;\"\u003eSMSL PA200 vs. PA400\u003c\/h2\u003e\n\u003cp style=\"font-size: 14.5px; color: #666; max-width: 650px; margin: 0 auto;\"\u003eBoth the PA200 and the flagship PA400 share SMSL's reference-class GaN FET DNA—delivering a liquid, tube-like analog midrange via ultra-fast 1MHz switching speed. Explore their distinct physical, technical, and power differences below.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- 2. The Head-to-Head Comparison Table --\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 40px; border-radius: 6px; border: 1px solid #eaeaea;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 13.5px; color: #333; text-align: left;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #111111; border-bottom: 2px solid #b89775; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; font-weight: 600; width: 34%; font-family: inherit;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; font-weight: 600; width: 33%; font-family: inherit; color: #b89775;\"\u003eSMSL PA200\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; font-weight: 600; font-family: inherit;\"\u003eSMSL PA400 (Flagship)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003c!-- Row 1 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eAmplifier Topology\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003eGerman Infineon GaN FET (1MHz)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003eGerman Infineon GaN FET (1MHz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 2 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eVolume Controller\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003eTexas Instruments PGA2311\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003eTexas Instruments PGA2311\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 3 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eStereo Output Power (4Ω)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 600; color: #111;\"\u003e160W + 160W RMS\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 600; color: #b89775;\"\u003e250W + 250W RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 4 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eStereo Output Power (8Ω)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 600; color: #111;\"\u003e85W + 85W RMS\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 600; color: #b89775;\"\u003e200W + 200W RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 5 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eMono Bridged Power (8Ω)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003e250W x 1 RMS\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 600; color: #b89775;\"\u003e500W x 1 RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 6 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eMono Bridged Power (4Ω)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003e400W x 1 RMS\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #888;\"\u003eNot Recommended (Mono 8Ω Only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 7 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eSignal-to-Noise Ratio (SNR)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003e109dB\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 600; color: #b89775;\"\u003e115dB (Reference Silent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 8 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eTHD+N\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003e0.003%\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003e0.003%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 9 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003ePure Amp Pass-Through\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003eYes (Bypasses preamp volume)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003eYes (Bypasses preamp volume)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 10 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eEnclosure and Build\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003eUltra-Compact, Sleek Sandblasting\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003eFlagship solid CNC-milled aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 11 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #ffffff;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eDimensions (W x H x D)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003e220 x 45.9 x 175 mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003e254 x 47.7 x 242 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c!-- Row 12 --\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee; background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 12px 16px; font-weight: 500;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003e1.44 kg \/ 3.17 lbs\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 16px; color: #555;\"\u003e2.58 kg \/ 5.69 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- 3. Aesthetic System Pairing Guide --\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: 600; color: #111; border-bottom: 1px solid #eee; padding-bottom: 8px; margin-top: 40px; margin-bottom: 25px; text-transform: uppercase; letter-spacing: 0.5px; font-family: inherit;\"\u003eSystem Synergy \u0026amp; Application Guide\u003c\/h3\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 15px; justify-content: space-between; margin-bottom: 30px;\"\u003e\n\u003c!-- Card 1: PA200 Positioning --\u003e\n\u003cdiv style=\"flex: 1 1 calc(50% - 10px); min-width: 280px; box-sizing: border-box; background-color: #fff; padding: 24px; border-radius: 8px; border: 1px solid #eaeaea;\"\u003e\n\u003cdiv style=\"display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px;\"\u003e\n\u003ch4 style=\"margin: 0; font-size: 15px; font-weight: 600; color: #111;\"\u003eSMSL PA200 — The Compact Studio\u003c\/h4\u003e\n\u003cspan style=\"font-size: 11px; background-color: #fafafa; border: 1px solid #eee; padding: 2px 8px; border-radius: 10px; color: #b89775; font-weight: bold;\"\u003eDESKTOP \u0026amp; NEARFIELD\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin: 0 0 10px 0; font-size: 12.5px; color: #666; line-height: 1.6;\"\u003e\u003cstrong\u003eBest Suited For:\u003c\/strong\u003e Desktop audio stacks, cozy listening dens, nearfield studio monitoring, and efficient bookshelf speakers.\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.6;\"\u003e\u003cstrong\u003eWhy it wins:\u003c\/strong\u003e With its smaller 220mm footprint, the PA200 slides effortlessly into compact modern workspaces. It provides incredible, uncolored high frequencies and is exceptionally efficient at standard nearfield listening distances.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Card 2: PA400 Positioning --\u003e\n\u003cdiv style=\"flex: 1 1 calc(50% - 10px); min-width: 280px; box-sizing: border-box; background-color: #fff; padding: 24px; border-radius: 8px; border: 1px solid #eaeaea;\"\u003e\n\u003cdiv style=\"display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px;\"\u003e\n\u003ch4 style=\"margin: 0; font-size: 15px; font-weight: 600; color: #111;\"\u003eSMSL PA400 — The Flagship Powerhouse\u003c\/h4\u003e\n\u003cspan style=\"font-size: 11px; background-color: #fafafa; border: 1px solid #eee; padding: 2px 8px; border-radius: 10px; color: #b89775; font-weight: bold;\"\u003eLIVING ROOM \u0026amp; TOWERS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin: 0 0 10px 0; font-size: 12.5px; color: #666; line-height: 1.6;\"\u003e\u003cstrong\u003eBest Suited For:\u003c\/strong\u003e Flagship home audio stacks, large living room environments, hard-to-drive dynamic floorstanding speakers, and planar magnetic speaker configurations.\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 12.5px; color: #666; line-height: 1.6;\"\u003e\u003cstrong\u003eWhy it wins:\u003c\/strong\u003e Armed with a massive 500W mono bridged capacity and a silent 115dB SNR, the flagship PA400 controls demanding crossovers effortlessly. Its thick CNC-milled solid aluminum case provides absolute physical noise isolation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- SMSL PA200 vs PA400 Reference GaN Amplifier Comparison Guide END --\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- 8. Original Images with SEO-friendly Descriptive Alt Tags --\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0130\/6591\/2420\/files\/XQ3PA40051.jpg?v=1760412968\" alt=\"SMSL PA400 stereo power amplifier elegant front view with silver volume knob and LCD screen\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto 15px;\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0130\/6591\/2420\/files\/XQ3PA40052.jpg?v=1760412969\" alt=\"SMSL PA400 reference high power amplifier on desktop setup alongside compact hifi stack\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto 15px;\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0130\/6591\/2420\/files\/XQ3PA40053.jpg?v=1760412969\" alt=\"SMSL PA400 premium GaN audio amplifier diagonal chassis perspective view\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto 15px;\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0130\/6591\/2420\/files\/XQ3PA40054.jpg?v=1760412969\" alt=\"SMSL PA400 rear panel interface with balanced XLR inputs RCA speaker output terminals and mono BTL connector\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto 15px;\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0130\/6591\/2420\/files\/XQ3PA40055.jpg?v=1760412969\" alt=\"SMSL PA400 audiophile amplifier accessories including high quality remote control\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto 15px;\"\u003e\u003c\/p\u003e","brand":"SMSL","offers":[{"title":"Default Title","offer_id":47019386437876,"sku":"HIFIEXPRESSPA400","price":555.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0130\/6591\/2420\/files\/8-GTPA40001.jpg?v=1773366710","url":"https:\/\/www.hifi-express.com\/de\/products\/smsl-pa400","provider":"Hifi-express","version":"1.0","type":"link"}