{"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 data-start=\"117\" data-end=\"448\"\u003eUpgrade your car audio system with the \u003cstrong data-start=\"156\" data-end=\"198\"\u003eAlpine SWJ-12S4 J-Series 12″ Subwoofer\u003c\/strong\u003e, engineered to deliver \u003cstrong data-start=\"222\" data-end=\"282\"\u003edeep, impactful bass with high efficiency and durability\u003c\/strong\u003e. Designed as part of Alpine’s \u003cstrong data-start=\"313\" data-end=\"347\"\u003eentry-level performance series\u003c\/strong\u003e, this subwoofer is ideal for users looking to add \u003cstrong data-start=\"398\" data-end=\"447\"\u003estrong low-end punch without heavy investment\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"450\" data-end=\"675\"\u003eFeaturing a \u003cstrong data-start=\"462\" data-end=\"510\"\u003e12-inch large driver with a 4-ohm voice coil\u003c\/strong\u003e, the SWJ-12S4 produces \u003cstrong data-start=\"534\" data-end=\"607\"\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 data-start=\"677\" data-end=\"680\"\u003e\n\u003ch2 data-section-id=\"1ug1b4y\" data-start=\"682\" data-end=\"700\"\u003e🔊 Key Features\u003c\/h2\u003e\n\u003cp data-start=\"702\" data-end=\"797\"\u003e✔ \u003cstrong data-start=\"704\" data-end=\"738\"\u003e12″ High-Performance Subwoofer\u003c\/strong\u003e – Large cone area delivers deeper and more powerful bass\u003c\/p\u003e\n\u003cp data-start=\"799\" data-end=\"921\"\u003e✔ \u003cstrong data-start=\"801\" data-end=\"831\"\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 data-start=\"923\" data-end=\"1062\"\u003e✔ \u003cstrong data-start=\"925\" data-end=\"954\"\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 data-start=\"1064\" data-end=\"1186\"\u003e✔ \u003cstrong data-start=\"1066\" data-end=\"1088\"\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 data-start=\"1188\" data-end=\"1321\"\u003e✔ \u003cstrong data-start=\"1190\" data-end=\"1233\"\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 data-start=\"1323\" data-end=\"1405\"\u003e✔ \u003cstrong data-start=\"1325\" data-end=\"1344\"\u003e4 Ohm Impedance\u003c\/strong\u003e – Compatible with most mono amplifiers and standard setups\u003c\/p\u003e\n\u003cp data-start=\"1407\" data-end=\"1498\"\u003e✔ \u003cstrong data-start=\"1409\" data-end=\"1435\"\u003eHigh Efficiency Design\u003c\/strong\u003e – Delivers strong output even with moderate power amplifiers\u003c\/p\u003e\n\u003cp data-start=\"1500\" data-end=\"1625\"\u003e✔ \u003cstrong data-start=\"1502\" data-end=\"1533\"\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 data-start=\"1627\" data-end=\"1630\"\u003e\n\u003ch2 data-section-id=\"1di4u4i\" data-start=\"1632\" data-end=\"1662\"\u003e🔧 Technical Specifications\u003c\/h2\u003e\n\u003cul data-start=\"1664\" data-end=\"2247\"\u003e\n\u003cli data-section-id=\"1vrbynb\" data-start=\"1664\" data-end=\"1698\"\u003e\n\u003cstrong data-start=\"1666\" data-end=\"1676\"\u003eModel:\u003c\/strong\u003e SWJ-12S4 (J-Series)\u003c\/li\u003e\n\u003cli data-section-id=\"mschbf\" data-start=\"1699\" data-end=\"1776\"\u003e\n\u003cstrong data-start=\"1701\" data-end=\"1720\"\u003eSubwoofer Size:\u003c\/strong\u003e 12 Inch (30 cm) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1bd673i\" data-start=\"1777\" data-end=\"1843\"\u003e\n\u003cstrong data-start=\"1779\" data-end=\"1793\"\u003eRMS Power:\u003c\/strong\u003e 250 Watts \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"tyt2c8\" data-start=\"1844\" data-end=\"1911\"\u003e\n\u003cstrong data-start=\"1846\" data-end=\"1861\"\u003ePeak Power:\u003c\/strong\u003e 750 Watts \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"t2snlj\" data-start=\"1912\" data-end=\"1991\"\u003e\n\u003cstrong data-start=\"1914\" data-end=\"1937\"\u003eFrequency Response:\u003c\/strong\u003e ~22Hz – 200Hz \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1pa2nil\" data-start=\"1992\" data-end=\"2056\"\u003e\n\u003cstrong data-start=\"1994\" data-end=\"2008\"\u003eImpedance:\u003c\/strong\u003e 4 Ohm \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"111fow2\" data-start=\"2057\" data-end=\"2140\"\u003e\n\u003cstrong data-start=\"2059\" data-end=\"2077\"\u003eCone Material:\u003c\/strong\u003e Polypropylene + Mica \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"o2bo06\" data-start=\"2141\" data-end=\"2168\"\u003e\n\u003cstrong data-start=\"2143\" data-end=\"2156\"\u003eSurround:\u003c\/strong\u003e Poly-Foam\u003c\/li\u003e\n\u003cli data-section-id=\"1xgckj6\" data-start=\"2169\" data-end=\"2247\"\u003e\n\u003cstrong data-start=\"2171\" data-end=\"2190\"\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 data-start=\"2249\" data-end=\"2252\"\u003e\n\u003ch2 data-section-id=\"1qc1r63\" data-start=\"2254\" data-end=\"2276\"\u003e📦 Package Includes\u003c\/h2\u003e\n\u003cul data-start=\"2278\" data-end=\"2352\"\u003e\n\u003cli data-section-id=\"gzndlg\" data-start=\"2278\" data-end=\"2311\"\u003e1 × Alpine SWJ-12S4 Subwoofer\u003c\/li\u003e\n\u003cli data-section-id=\"1uqkuoz\" data-start=\"2312\" data-end=\"2336\"\u003eMounting Accessories\u003c\/li\u003e\n\u003cli data-section-id=\"16w5ib\" data-start=\"2337\" data-end=\"2352\"\u003eUser Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2354\" data-end=\"2357\"\u003e\n\u003ch2 data-section-id=\"qry3f0\" data-start=\"2359\" data-end=\"2391\"\u003e🚗 Why Choose Alpine SWJ-12S4\u003c\/h2\u003e\n\u003cul data-start=\"2393\" data-end=\"2647\"\u003e\n\u003cli data-section-id=\"h2rgzm\" data-start=\"2393\" data-end=\"2446\"\u003eStrong \u003cstrong data-start=\"2402\" data-end=\"2444\"\u003edeep bass output with large 12″ driver\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"9l634k\" data-start=\"2447\" data-end=\"2484\"\u003eReliable \u003cstrong data-start=\"2458\" data-end=\"2482\"\u003eAlpine build quality\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"y1123z\" data-start=\"2485\" data-end=\"2530\"\u003ePerfect for \u003cstrong data-start=\"2499\" data-end=\"2528\"\u003eentry-level bass upgrades\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"2eljnm\" data-start=\"2531\" data-end=\"2587\"\u003eWorks well with \u003cstrong data-start=\"2549\" data-end=\"2585\"\u003emono amplifiers (250–400W range)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"i81snj\" data-start=\"2588\" data-end=\"2647\"\u003eIdeal for \u003cstrong data-start=\"2600\" data-end=\"2645\"\u003eSUVs, sedans \u0026amp; hatchbacks with boot space\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2649\" data-end=\"2652\"\u003e\n\u003ch2 data-section-id=\"7d3zfr\" data-start=\"2654\" data-end=\"2678\"\u003e🛠 Installation Notes\u003c\/h2\u003e\n\u003cul data-start=\"2680\" data-end=\"2961\"\u003e\n\u003cli data-section-id=\"13bzbno\" data-start=\"2680\" data-end=\"2725\"\u003eRequires external amplifier for operation\u003c\/li\u003e\n\u003cli data-section-id=\"nqc9c7\" data-start=\"2726\" data-end=\"2784\"\u003eBest performance in \u003cstrong data-start=\"2748\" data-end=\"2782\"\u003esealed or ported enclosure box\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"12f5811\" data-start=\"2785\" data-end=\"2888\"\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 data-section-id=\"zjzo2w\" data-start=\"2889\" data-end=\"2961\"\u003eProfessional installation recommended for tuning and enclosure setup\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ALPINE","offers":[{"title":"Default Title","offer_id":51998522376493,"sku":"TCZ-ALIPINE-SWJ-12S4","price":6520.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0913\/1848\/5293\/files\/Alpine_SWJ-12S4_12_inch_subwoofer_delivering_250W_RMS_and_750W_peak_power_with_deep_bass_and_durable_construction_for_car_audio_systems.webp?v=1776762183","url":"https:\/\/nhone.in\/products\/alpine-swj-12s4-j-series-12-subwoofer-250w-rms-750w-peak","provider":"NH ONE","version":"1.0","type":"link"}