{"product_id":"fosi-audio-p4-desktop-hifi-preamplifier","title":"Fosi Audio P4 | Desktop HiFi Preamplifier with Swappable Op-Amps","description":"\u003cdiv style=\"color:#1a1a1a; font-family: 'Helvetica Neue', Arial, sans-serif; line-height: 1.8; font-size: 16px;\"\u003e\n  \u003cp style=\"font-size: 18px; color: #333; line-height: 1.8; margin-bottom: 20px;\"\u003e\n    \u003cstrong style=\"color:#1a1a1a;\"\u003eIn an era dominated by hyper-compressed streaming and clinical digital-to-analog converters, sound has lost its physical warmth.\u003c\/strong\u003e The \u003cstrong style=\"color:#1a1a1a;\"\u003eFosi Audio P4\u003c\/strong\u003e is designed as the restorative heart of the modern desktop audio system—a precision analog preamplifier engineered to reclaim tone, dynamic headroom, and intimate musical presence.\n  \u003c\/p\u003e\n\n  \u003cdiv style=\"margin: 30px 0; text-align: center;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S6f3b908e5aa34dd296b4234244d2a9882.webp?v=1770272150\" alt=\"Fosi Audio P4 Desktop HiFi Preamplifier Front View\" style=\"max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.08);\"\u003e\n    \u003cp style=\"font-size: 13px; color: #666; margin-top: 8px; font-style: italic;\"\u003eThe Fosi Audio P4 featuring precision CNC aluminum volume dial, independent tone controls, and source selector switch.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2 style=\"color:#1a1d20 !important; font-size: 22px; margin-top: 35px; border-bottom: 2px solid #8200fa; padding-bottom: 8px;\"\u003eArchitectural Masterclass in Analog Sound\u003c\/h2\u003e\n  \u003cp style=\"margin-bottom: 15px;\"\u003e\n    The P4 acts as an uncompromised control center between your digital sources (DACs, streamers, turntables) and power amplifiers or active studio monitors. Featuring three independent gold-plated RCA inputs, the P4 eliminates the need to constantly swap audio interconnects. With a dedicated source selector switch on the front panel, transitions between digital streaming, analog vinyl, and secondary DAC setups remain seamless and noiseless.\n  \u003c\/p\u003e\n\n  \u003cdiv style=\"background-color: #f8f5ff; border-left: 4px solid #8200fa; padding: 20px; border-radius: 0 8px 8px 0; margin: 25px 0;\"\u003e\n    \u003ch3 style=\"color:#2d3236 !important; margin: 0 0 10px 0; font-size: 18px;\"\u003eKey Performance Highlights\u003c\/h3\u003e\n    \u003cul style=\"margin: 0; padding-left: 20px; color: #333;\"\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eSwappable Dual DIP-8 Op-Amp Sockets:\u003c\/strong\u003e Comes factory-equipped with Texas Instruments NE5532 op-amps, allowing audiophiles to effortlessly roll op-amps (e.g., OPA2134, MUSES02, SparkoS SS3602) to tailor soundstage and tonal texture.\u003c\/li\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003e3 Gold-Plated RCA Inputs + 1 RCA Output:\u003c\/strong\u003e Simultaneously connect multiple desktop sources without signal degradation or crosstalk.\u003c\/li\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eHardware Tone Bypass Mode:\u003c\/strong\u003e Pure direct analog pass-through switch bypasses treble\/bass equalization circuits for absolute signal neutrality when paired with high-end reference DACs.\u003c\/li\u003e\n      \u003cli style=\"margin-bottom: 0;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003ePrecision Equalization Circuitry:\u003c\/strong\u003e Smooth ±6dB treble and bass tone controls allow tailored acoustic correction for near-field desktop reflections and speaker voicing.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin: 30px 0; text-align: center;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S52084b4bcce442eb8e4b72208ec7bc62T.webp?v=1770272150\" alt=\"Fosi Audio P4 Rear Panel Ports\" style=\"max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.08);\"\u003e\n    \u003cp style=\"font-size: 13px; color: #666; margin-top: 8px; font-style: italic;\"\u003eRear panel gold-plated RCA terminals ensuring high conductivity and zero ground loop noise.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2 style=\"color:#1a1d20 !important; font-size: 22px; margin-top: 35px; border-bottom: 2px solid #8200fa; padding-bottom: 8px;\"\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; background: #ffffff; border: 1px solid #e1e1e1; color: #1a1a1a;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"background-color: #1a1d20; color: #ffffff;\"\u003e\n        \u003cth style=\"padding: 12px 15px; text-align: left; border: 1px solid #1a1d20; color:#ffffff;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"padding: 12px 15px; text-align: left; border: 1px solid #1a1d20; color:#ffffff;\"\u003eSpecification\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; font-weight: bold; color:#1a1a1a;\"\u003eAudio Inputs\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; color:#1a1a1a;\"\u003e3 Sets of Stereo RCA Terminals\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background-color: #fafafa;\"\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; font-weight: bold; color:#1a1a1a;\"\u003eAudio Output\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; color:#1a1a1a;\"\u003e1 Set of Stereo RCA Terminals\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; font-weight: bold; color:#1a1a1a;\"\u003eOp-Amp Architecture\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; color:#1a1a1a;\"\u003eDual TI NE5532 (DIP-8 Swappable Sockets)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background-color: #fafafa;\"\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; font-weight: bold; color:#1a1a1a;\"\u003eFrequency Response\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; color:#1a1a1a;\"\u003e20Hz - 20kHz (±0.5dB)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; font-weight: bold; color:#1a1a1a;\"\u003eTone Adjustment Range\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; color:#1a1a1a;\"\u003eTreble ±6dB, Bass ±6dB (Bypass Switchable)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background-color: #fafafa;\"\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; font-weight: bold; color:#1a1a1a;\"\u003eTHD+N\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; color:#1a1a1a;\"\u003e≤ 0.003% @ 1kHz\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; font-weight: bold; color:#1a1a1a;\"\u003eSNR\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; color:#1a1a1a;\"\u003e≥ 102dB\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background-color: #fafafa;\"\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; font-weight: bold; color:#1a1a1a;\"\u003ePower Supply\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px 15px; border: 1px solid #eee; color:#1a1a1a;\"\u003eDC 12V High-Precision Power Adapter\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003cdiv style=\"margin: 30px 0; text-align: center;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Se2a921d0948047abbcaaf6aa0e4205b4x.webp?v=1770272151\" alt=\"Fosi Audio P4 Internal DIP-8 Socket Architecture\" style=\"max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.08);\"\u003e\n    \u003cp style=\"font-size: 13px; color: #666; margin-top: 8px; font-style: italic;\"\u003eTool-less op-amp swapping architecture allowing infinite customization of sound characteristics.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Fosi Audio P4 | Desktop HiFi Preamplifier with Swappable Op-Amps\",\n  \"image\": \"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S6f3b908e5aa34dd296b4234244d2a9882.webp?v=1770272150\",\n  \"description\": \"High-fidelity desktop analog preamplifier featuring 3 gold-plated RCA inputs, hardware EQ bypass mode, and swappable DIP-8 socket op-amps for custom sound tuning.\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Fosi Audio\"\n  },\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"url\": \"https:\/\/eastsupplier.com\/products\/fosi-audio-p4-desktop-hifi-preamplifier\",\n    \"priceCurrency\": \"USD\",\n    \"price\": \"219.99\",\n    \"availability\": \"https:\/\/schema.org\/InStock\"\n  }\n}\n\u003c\/script\u003e","brand":"East Supplier Platform","offers":[{"title":"with power supply \/ China Mainland","offer_id":48422300025055,"sku":"1005008505365346-with power supply-China Mainland","price":219.99,"currency_code":"USD","in_stock":true},{"title":"with power supply \/ brazil","offer_id":48422300090591,"sku":"1005008505365346-with power supply-brazil","price":225.99,"currency_code":"USD","in_stock":true},{"title":"P4 and V3 32V \/ China Mainland","offer_id":48422300352735,"sku":"1005008505365346-P4 and V3 32V-China Mainland","price":405.99,"currency_code":"USD","in_stock":true},{"title":"P4 and V3 48V \/ China Mainland","offer_id":48422300549343,"sku":"1005008505365346-P4 and V3 48V-China Mainland","price":439.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S6f3b908e5aa34dd296b4234244d2a9882.webp?v=1770272150","url":"https:\/\/eastsupplier.com\/fr-it\/products\/fosi-audio-p4-desktop-hifi-preamplifier","provider":"EastSupplier Platform","version":"1.0","type":"link"}