Sundown Audio SD v.4 12" 600W RMS Neo Shallow Subwoofer – Dual 2 Ohm

Get serious Sundown Audio bass without sacrificing valuable space with the Sundown Audio SD-Series v.4 12" Neo D2 Subwoofer. Designed specifically for small sealed enclosures and limited-depth installations, the SD v.4 combines a lightweight neodymium motor, shallow 4.9-inch mounting depth, 600-watt RMS power handling and 14.5mm X-Max in a high-strength cast aluminum frame.

This Dual 2-Ohm (D2) version is an excellent choice for custom truck boxes, behind-seat and under-seat applications, single-cab pickups, crew-cab trucks and other installations where a conventional deep-basket 12-inch subwoofer may not fit.

If you want Sundown Audio performance in a compact enclosure, the SD v.4 12 is built specifically for that job.

🔥 600W RMS / 1200W PEAK POWER

The current SD v.4 12" is rated at:

600 Watts RMS
1200 Watts Peak

Sundown Audio has also posted a notice that some older packaging may show previous power ratings while its current published specifications reflect updated real-world ratings. For your East Car Audio listing, I recommend using the current official 600W RMS / 1200W peak figures.

🧲 LIGHTWEIGHT NEODYMIUM MOTOR

One of the biggest differences between the SD v.4 and many traditional shallow subwoofers is its neodymium motor structure.

Neodymium allows Sundown to produce a compact and lightweight motor while maintaining the magnetic force needed for a high-performance subwoofer.

The result is a 12-inch woofer designed to provide serious output without the huge ferrite motor found on many full-depth high-power subwoofers.

For custom truck installations where depth, enclosure volume and weight matter, that's a major advantage.

📏 ONLY 4.9" MOUNTING DEPTH

Need a 12-inch subwoofer but don't have room for a conventional deep basket?

The SD v.4 12 requires only 4.9 inches of mounting depth.

That makes it an excellent candidate for space-limited installations such as:

Single-Cab Trucks • Crew-Cab Trucks • Behind-Seat Boxes • Under-Seat Enclosures • Shallow Truck Boxes • Custom Center Consoles • Space-Saving Car Audio Builds

The overall diameter is 12.50 inches, while the required cutout diameter is 10.50 inches.

🔊 BUILT FOR SMALL SEALED BOXES

You don't need a giant enclosure to get this Sundown 12 working properly.

Sundown Audio officially recommends:

0.8–1.0 Cubic Feet Sealed

for the SD v.4 12".

That's one of the biggest reasons this subwoofer works so well for truck installations.

Instead of sacrificing rear-seat space to a large enclosure, the SD v.4 is engineered around a compact sealed-box application.

Important: Sundown currently lists conventional ported enclosures as “Not Recommended” for the SD v.4 12".

So for most customers, we recommend building this woofer around the manufacturer's 0.8–1.0 cu. ft. sealed specification rather than treating it like a conventional ported-box subwoofer.

🔥 14.5MM X-MAX

A shallow design doesn't mean Sundown eliminated excursion.

The SD v.4 12" has a published 14.5mm X-Max, giving the woofer substantial linear excursion for its compact design.

Sundown combines this with a computer-optimized foam W-surround, which is engineered to support the cone through its movement while maintaining the compact mechanical layout.

🌀 2" 8-LAYER COPPER VOICE COIL

At the center of the SD v.4 is a:

2-Inch, 8-Layer Copper Voice Coil

Sundown also uses high-temperature voice-coil wire to support the woofer's thermal demands.

This D2 version uses dual 2-ohm voice coils, giving installers useful wiring flexibility when matching the subwoofer to a compatible monoblock amplifier.

🎵 DESIGNED FOR SOUND QUALITY

The SD-Series isn't simply about fitting a woofer into a shallow box.

Sundown describes the SD v.4 as a sound-quality-oriented woofer combining low mounting depth, small enclosure requirements and high power handling.

A large aluminum Faraday ring is incorporated into the motor design to help provide smoother acoustic response, while Sundown's low-distortion motor construction further supports the SD-Series' sound-quality focus.

For someone who wants tight, controlled daily bass from a small sealed truck enclosure, this is exactly the type of application the SD v.4 was designed around.

💪 HIGH-STRENGTH CAST ALUMINUM FRAME

Sundown uses its patented high-strength cast aluminum frame rather than a basic stamped-steel basket.

Additional construction features include:

Computer-Optimized Foam W-Surround
High-Temperature Voice-Coil Wire
Spring-Loaded Terminals
Stitched-On Tinsel Leads
Large Aluminum Faraday Ring
Low-Distortion Motor Construction

These are all features confirmed on Sundown Audio's current SD v.4 product page.

⚡ KEY FEATURES

• 12-inch shallow-mount Neo subwoofer
• 600W RMS
• 1200W peak
• Dual 2-ohm (D2) voice coils
• Lightweight neodymium motor
• Only 4.9" mounting depth
• 14.5mm X-Max
• Optimized for small sealed enclosures
• Recommended sealed volume: 0.8–1.0 cu. ft.
• 2" 8-layer copper voice coil
• High-temperature voice-coil wire
• Computer-optimized foam W-surround
• Large aluminum Faraday ring
• Low-distortion motor design
• High-strength cast aluminum frame
• Spring-loaded terminals
• Stitched-on tinsel leads
• Excellent choice for compact truck subwoofer enclosures

📊 SUNDOWN SD v.4 12 D2 SPECIFICATIONS

These specifications are taken from Sundown Audio's current official SD v.4 12 D2 data.

🚚 EXCELLENT FOR SHALLOW TRUCK BOXES

This is where I would really target your East Car Audio customer base.

The combination of a 4.9-inch mounting depth and 0.8–1.0 cu. ft. sealed enclosure requirement makes the SD v.4 12 particularly attractive for pickup-truck audio systems where space is limited.

It's a strong candidate for custom shallow enclosures in vehicles such as:

Chevy Silverado • GMC Sierra • Ford F-150 • Ram Trucks • Single Cab Trucks • Extended Cab Trucks • Crew Cab Trucks

Actual fitment depends on the enclosure's mounting depth, cutout and available airspace, so always compare the box specifications with the woofer before installation.

🔌 DUAL 2-OHM WIRING FLEXIBILITY

This listing is specifically for the D2 / Dual 2-Ohm version.

A single D2 woofer can typically be configured for a 1-ohm or 4-ohm final nominal load, depending on whether its two voice coils are wired in parallel or series.

That makes the D2 model particularly useful when pairing a single SD v.4 with a compatible monoblock amplifier.

📦 WHAT'S INCLUDED

1 × Sundown Audio SD-Series v.4 12" Neo Subwoofer – Dual 2 Ohm

This listing is for one subwoofer, not a pair.

⭐ LOOKING FOR THE BEST PLACE TO BUY A SUNDOWN AUDIO SD v.4 12 D2?

Shop East Car Audio.

If you're searching for the best place to buy a Sundown Audio SD v.4 12, where to buy a Sundown SD-4 12 D2, or a 600W RMS shallow 12-inch Sundown subwoofer, shop East Car Audio.

East Car Audio specializes in Sundown Audio subwoofers, shallow truck subwoofer boxes, monoblock amplifiers, amp wiring, custom truck audio and complete bass-system components.