
- Description
- Reviews
Upgrade your car audio system with the Alpine SWJ-12S4 J-Series 12″ Subwoofer, engineered to deliver deep, impactful bass with high efficiency and durability. Designed as part of Alpine’s entry-level performance series, this subwoofer is ideal for users looking to add strong low-end punch without heavy investment.
Featuring a 12-inch large driver with a 4-ohm voice coil, the SWJ-12S4 produces tight bass response, improved air movement, and better sound pressure, making it perfect for bass-heavy music and daily listening setups.
🔊 Key Features
✔ 12″ High-Performance Subwoofer – Large cone area delivers deeper and more powerful bass
✔ 250W RMS / 750W Peak Power – Strong and controlled bass output for daily use
✔ Polypropylene + Mica Cone – Lightweight yet rigid construction for accurate bass reproduction
✔ Poly-Foam Surround – Enhances cone movement and durability for long-term use
✔ Wide Frequency Response (≈22Hz – 200Hz) – Covers deep low frequencies for powerful bass
✔ 4 Ohm Impedance – Compatible with most mono amplifiers and standard setups
✔ High Efficiency Design – Delivers strong output even with moderate power amplifiers
✔ Budget-Friendly Performance – Ideal for entry-level to mid-range audio upgrades
🔧 Technical Specifications
- Model: SWJ-12S4 (J-Series)
- Subwoofer Size: 12 Inch (30 cm)
- RMS Power: 250 Watts
- Peak Power: 750 Watts
- Frequency Response: ~22Hz – 200Hz
- Impedance: 4 Ohm
- Cone Material: Polypropylene + Mica
- Surround: Poly-Foam
- Mounting Depth: Approx. 135 mm
📦 Package Includes
- 1 × Alpine SWJ-12S4 Subwoofer
- Mounting Accessories
- User Manual
🚗 Why Choose Alpine SWJ-12S4
- Strong deep bass output with large 12″ driver
- Reliable Alpine build quality
- Perfect for entry-level bass upgrades
- Works well with mono amplifiers (250–400W range)
- Ideal for SUVs, sedans & hatchbacks with boot space
🛠 Installation Notes
- Requires external amplifier for operation
- Best performance in sealed or ported enclosure box
- Recommended sealed box: ~1.0 cu.ft / ported box: ~1.8 cu.ft
- Professional installation recommended for tuning and enclosure setup
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