Description:

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