{"product_id":"alpine-swj-12s4-j-series-12-subwoofer-250w-rms-750w-peak","title":"Alpine SWJ-12S4 J-Series 12″ Subwoofer (250W RMS \/ 750W Peak)","description":"\u003cp\u003eUpgrade your car audio system with the \u003cstrong\u003eAlpine SWJ-12S4 J-Series 12″ Subwoofer\u003c\/strong\u003e, engineered to deliver \u003cstrong\u003edeep, impactful bass with high efficiency and durability\u003c\/strong\u003e. Designed as part of Alpine’s \u003cstrong\u003eentry-level performance series\u003c\/strong\u003e, this subwoofer is ideal for users looking to add \u003cstrong\u003estrong low-end punch without heavy investment\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eFeaturing a \u003cstrong\u003e12-inch large driver with a 4-ohm voice coil\u003c\/strong\u003e, the SWJ-12S4 produces \u003cstrong\u003etight bass response, improved air movement, and better sound pressure\u003c\/strong\u003e, making it perfect for bass-heavy music and daily listening setups.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🔊 Key Features\u003c\/h2\u003e\n\u003cp\u003e✔ \u003cstrong\u003e12″ High-Performance Subwoofer\u003c\/strong\u003e – Large cone area delivers deeper and more powerful bass\u003c\/p\u003e\n\u003cp\u003e✔ \u003cstrong\u003e250W RMS \/ 750W Peak Power\u003c\/strong\u003e – Strong and controlled bass output for daily use \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e✔ \u003cstrong\u003ePolypropylene + Mica Cone\u003c\/strong\u003e – Lightweight yet rigid construction for accurate bass reproduction \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e✔ \u003cstrong\u003ePoly-Foam Surround\u003c\/strong\u003e – Enhances cone movement and durability for long-term use \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e✔ \u003cstrong\u003eWide Frequency Response (≈22Hz – 200Hz)\u003c\/strong\u003e – Covers deep low frequencies for powerful bass \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e✔ \u003cstrong\u003e4 Ohm Impedance\u003c\/strong\u003e – Compatible with most mono amplifiers and standard setups\u003c\/p\u003e\n\u003cp\u003e✔ \u003cstrong\u003eHigh Efficiency Design\u003c\/strong\u003e – Delivers strong output even with moderate power amplifiers\u003c\/p\u003e\n\u003cp\u003e✔ \u003cstrong\u003eBudget-Friendly Performance\u003c\/strong\u003e – Ideal for entry-level to mid-range audio upgrades \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🔧 Technical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e SWJ-12S4 (J-Series)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubwoofer Size:\u003c\/strong\u003e 12 Inch (30 cm) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRMS Power:\u003c\/strong\u003e 250 Watts \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak Power:\u003c\/strong\u003e 750 Watts \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e ~22Hz – 200Hz \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImpedance:\u003c\/strong\u003e 4 Ohm \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCone Material:\u003c\/strong\u003e Polypropylene + Mica \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurround:\u003c\/strong\u003e Poly-Foam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Depth:\u003c\/strong\u003e Approx. 135 mm \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e📦 Package Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Alpine SWJ-12S4 Subwoofer\u003c\/li\u003e\n\u003cli\u003eMounting Accessories\u003c\/li\u003e\n\u003cli\u003eUser Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e🚗 Why Choose Alpine SWJ-12S4\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eStrong \u003cstrong\u003edeep bass output with large 12″ driver\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eReliable \u003cstrong\u003eAlpine build quality\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePerfect for \u003cstrong\u003eentry-level bass upgrades\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWorks well with \u003cstrong\u003emono amplifiers (250–400W range)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eIdeal for \u003cstrong\u003eSUVs, sedans \u0026amp; hatchbacks with boot space\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e🛠 Installation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRequires external amplifier for operation\u003c\/li\u003e\n\u003cli\u003eBest performance in \u003cstrong\u003esealed or ported enclosure box\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRecommended sealed box: ~1.0 cu.ft \/ ported box: ~1.8 cu.ft \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eProfessional installation recommended for tuning and enclosure setup\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ALPINE","offers":[{"title":"Default Title","offer_id":48249953779764,"sku":"TCZ-ALIPINE-SWJ-12S4","price":6520.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0777\/9513\/1444\/files\/swj12s4-2.jpg?v=1789251347","url":"https:\/\/cardost.in\/products\/alpine-swj-12s4-j-series-12-subwoofer-250w-rms-750w-peak","provider":"CarDost","version":"1.0","type":"link"}