Sundown Audio SD-4 10" D2 Neo Shallow Mount Subwoofer | 600W RMS

The Sundown Audio SD-4 10" D2 Neo Shallow Mount Subwoofer is part of the SD v.4 Neo Series, Sundown’s premier shallow-mount sealed box solution and the direct successor to the SD-3. Built for today’s depth-restricted installations, the SD-4 delivers big bass performance in a compact footprint with 600 watts RMS power handling, rugged construction, and world-class sound quality.

Shallow Mount Design for Tight Installs

Most sealed-box applications face mounting depth limitations, and the SD-4 was designed to overcome them. By eliminating a pole vent, the motor can mount flush against the enclosure back wall, while the all-new “W” foam surround reduces the space needed in front of the cone. The result is an effective mounting depth nearly 2” less than most traditional shallow subwoofers — making it one of the most space-efficient high-performance subs available.

Advanced Motor & Cooling Technology

• Lightweight Neodymium Motor – Strong, compact, and reduces angled depth requirements compared to the SD-3.

• Side-Firing Gap Venting & OD Pole Channels – Engineered airflow for superior cooling without rear clearance.

• Large Aluminum Faraday Ring – Smooths frequency response while reducing distortion.

• Shorting Ring – Further minimizes inductance variation for precise, clean bass.

Precision Sound Quality Engineering

The SD-4 features an under-hung motor topology — the coil stays fully within the magnetic gap during operation. This provides an extremely flat BL curve and ultra-low distortion, giving you accurate, tight, and dynamic bass response. With 14.5mm of linear excursion (one-way), the SD-4 10" D2 is optimized for small sealed enclosures where space is limited but big output is required.

Rugged Construction for Daily Use

• RMS Power Handling: 600W RMS

• Voice Coil Configuration: Dual 2 Ohm (D2)

• Voice Coil: 2.5” black aluminum former with 8-layer high-temp copper winding

• Surround: Computer-optimized “W” foam surround for reduced clearance and improved strength

• Frame: Patented high-strength cast aluminum frame

• Durability: Stitched-on tinsel leads, spring-loaded terminals, and a reinforced spider system

Key Features at a Glance

• 600W RMS Power Handling

• Dual 2 Ohm Voice Coil (D2)

• 14.5mm Xmax (one-way by 70% BL)

• Lightweight Neo Motor for compact installs

• Under-hung motor for low distortion

• High-strength cast aluminum frame for durability

• Optimized for small sealed enclosures

Why Choose the Sundown SD-4 10" D2?

The Sundown Audio SD-4 10" D2 Neo Subwoofer is the perfect choice for enthusiasts who demand high-quality bass in tight spaces. Its shallow-mount design, rugged build, and advanced Neo motor technology allow it to outperform traditional shallow subs while fitting into modern vehicles with limited enclosure depth.

Whether for daily driving, SQ-focused builds, or compact SPL setups, the SD-4 10" D2 delivers clean, powerful, and reliable bass in a space-saving package.