Sundown Audio SD-4 12" D4 Neo Shallow Mount Subwoofer | 600W RMS

The Sundown Audio SD-4 12" D4 Neo Shallow Mount Subwoofer is part of Sundown’s SD v.4 Neo Series, designed for maximum bass performance in space-limited sealed box applications. As the direct successor to the SD-3, the SD-4 introduces a lightweight Neo motor, an innovative “W” foam surround, and upgraded durability — all while maintaining a shallow mounting depth ideal for today’s vehicles.

Shallow Mount Design, Deep Bass Performance

Depth restrictions are a common challenge in sealed enclosures, and the SD-4 was engineered to overcome them. With no pole vent, the motor can mount flush to the back wall, while the new “W” foam surround reduces front clearance needs to just about 1”. The result? An effective depth requirement nearly 2 inches less than most traditional shallow subs — without sacrificing power or sound quality.

Advanced Cooling & Motor Technology

• Lightweight Neo Motor – Reduces angled depth requirements compared to the SD-3.

• Side-Firing Gap Venting & OD Pole Channels – Optimized airflow for superior heat dissipation.

• Aluminum Faraday Ring & Shorting Ring – Smooth frequency response, reduced inductance, and lower distortion.

Engineered for Precision & Sound Quality

Featuring an under-hung motor topology, the SD-4 keeps its 8-layer copper coil fully within the gap, ensuring consistent BL and ultra-low distortion. With 14.5mm of linear excursion one-way, it delivers deep, accurate bass in compact sealed enclosures while maintaining Sundown’s legendary reliability.

Built for Power and Durability

• RMS Power Handling: 600W RMS

• Voice Coil Configuration: Dual 4 Ohm (D4)

• Voice Coil: 2.5" high-temp, 8-layer copper coil on aluminum former

• Surround: Computer-optimized foam “W” surround for reduced clearance and better linearity

• Frame: Patented high-strength cast aluminum frame

• Durability: Stitched-on tinsel leads, spring-loaded terminals, and improved spider for long-lasting performance

Why Choose the Sundown SD-4 12" D4?

The Sundown SD-4 12" D4 Neo Subwoofer is the perfect solution for bass enthusiasts who need big output in tight spaces. Its shallow mounting depth and Neo motor make it ideal for sealed enclosures in modern vehicles, while its rugged design ensures consistent performance for years to come.

Whether you’re chasing sound quality or compact SPL power, the SD-4 12" D4 delivers loud, clean, and reliable bass.