DOWN4SOUND – USED | SB 15″ SUBWOOFER| 500W RMS | D4

YOU ARE PURCHASING A USED ITEM.
Used products are sold as-is and may show signs of prior use, including cosmetic wear, scuffs, nicks, scratches, dents, damaged packaging, missing paperwork, missing accessories, or other imperfections unless otherwise stated in the product description.
You will receive a working item at a discounted price compared to regular pricing.

*Picture does not represent the actual item*
FINAL SALE/NO RETURNS

Experience powerful, deep, and accurate bass with the DOWN4SOUND SB-15 Subwoofer, designed for enthusiasts who demand strong low-frequency output in a versatile, durable design. Featuring a dual 4-ohm voice coil configuration and 500W RMS power handling, the SB-15 D4 delivers clean, controlled bass suitable for daily-driven systems and performance-focused builds. Its optimized suspension and robust motor structure ensure reliability and consistent performance.

Key Features

500W RMS power handling
Dual 4-ohm voice coil configuration
2.5-inch high-temperature voice coil
21 mm one-way Xmax
Highly optimized suspension
Versatile design for a wide range of installs

Technical Specifications (T/S Parameters)

Revc (DC Resistance): 6.130 ohm
Resonance Frequency (Fs): 31.067 Hz
Qms: 4.301
Qes: 0.939
Qts: 0.771
Mms (Moving Mass): 277.986 g
Cms (Compliance): 94.477 m/N
Rms: 0.736
Vas: 92.878 L
Sd: 582.958 cm
BL Product: 18.818 Tm
Sensitivity (SPL): 86.6 dB
Xmax: 21 mm
Displacement: 0.19 cu ft

Engineering and Construction

Optimized suspension for clean, accurate bass
Vented motor for improved heat management
Precision-wound 2.5-inch coil
Durable cone and surround assembly
Efficient motor design for controlled LF performance

Recommended Enclosures

Ported: 3.0 cu ft (net)
Port Area: 32 sq in
Port Tuning: 32 Hz
Sealed: Not recommended

Physical Dimensions

Cutout Diameter: 13.62 in (346 mm)
Outside Diameter: 15.51 in (394 mm)
Mounting Depth: 7.10 in (180 mm)
Motor Height: 3.54 in (90 mm)
Net Weight: 23.15lb
Gross Weight:25.35 lb

Why You Should Buy

Powerful, clean bass performance
Dual 4-ohm coils provide flexible wiring options
Durable construction for long-term reliability
Accurate and controlled low-frequency output

Ideal Applications

Ported enclosures delivering deep, strong bass
Daily drivers needing accurate LF response
SUVs, sedans, hatchbacks, and trucks
Users wanting high output without oversized power demands