





Down4Sound SB 12" Subwoofer 500W RMS
Many in-stock orders ship within 1-2 business days, but timing varies by item. Custom, built-to-order, oversized, special-order and supplier-direct products may need extra processing time. Free shipping applies to qualifying orders over $99 in the contiguous US. Approved returns may be subject to a restocking fee.
Most products are covered by the manufacturer's warranty against defects. Damage from over-powering or improper installation isn't covered — we'll help coordinate any valid claim.
Tell us your vehicle, subwoofers and electrical setup and our team will help you match the right gear. Reach out before you buy.
Subwoofer Wiring Diagram
Select your configuration to view possible wiring combinations.
Loading wiring diagrams…
Diagrams are on our wiring diagram page.
Experience the perfect blend of power and precision with the DOWN4SOUND SB-12 Subwoofer, designed for enthusiasts who crave deep, clean bass. Featuring a dual 2-ohm voice coil configuration and 500W RMS power handling, this subwoofer is optimized for versatile setups and delivers consistent, reliable low-frequency performance. Its durable construction ensures long-lasting use in any car audio system.
Key Features
- 500W RMS power handling
- Dual 2-ohm voice coil design
- 2.5-inch high-temperature voice coil
- 21 mm one-way Xmax
- Highly optimized suspension system
- Versatile design for a wide range of installs
Technical Specifications (T/S Parameters)
-
Revc (DC Resistance)
4.030 ohm -
Resonance Frequency (Fs)
29.296 Hz -
Qms
3.622 -
Qes
0.550 -
Qts
0.478 -
Mms (Moving Mass)
235.540 g -
Cms (Compliance)
125.928 μm/N -
Rms
0.768 -
Vas
46.407 L - Sd: 510.071 cm²
-
BL Product
17.824 T·m -
Sensitivity (SPL)
85.1 dB -
Xmax
21 mm -
Displacement
0.15 cu ft
Engineering and Construction
- Optimized suspension for controlled, accurate bass
- Vented motor for improved thermal performance
- Precision-wound 2.5-inch voice coil
- Durable cone and surround assembly
- Compact, efficient motor structure
Recommended Enclosures
-
Ported
1.75 cu ft (net) -
Port Area
26 sq in -
Port Tuning
35 Hz -
Sealed
Not recommended
Physical Dimensions
-
Cutout Diameter
10.87 in (276 mm) -
Outside Diameter
12.44 in (316 mm) -
Mounting Depth
6.81 in (173 mm) -
Motor Height
3.54 in (90 mm) -
Net Weight
22.05 lb -
Gross Weight
26.4 lb
Why You Should Buy
- Strong, clean bass performance
- Durable construction built for daily use
- Flexible dual 2-ohm wiring options
- Accurate, reliable low-frequency reproduction
Ideal Applications
Ported enclosures for deep, clean bass
SUVs, sedans, trucks, and hatchbacks
Space-efficient high-performance builds
Users seeking dependable, accurate low-frequency output
Authorized Down4Sound dealer at JS Ultimate Sounds. Free shipping on orders $99+.


