Dual Sundown Audio Xv3 12" Custom Subwoofer Enclosure – 5.0 ft³ High-Output Ported Box

Push your system to the next level with this handcrafted dual enclosure designed specifically for the Sundown Audio Xv3 12" subwoofers. Optimized for big bass, power handling, and clean sound, this custom-built box by Basshead Supply delivers SPL-ready performance with unmatched build quality.

Performance Specifications – Dual Xv3 12" Subwoofer Box

• Net Internal Volume: 5.0 cubic feet
• Tuning Frequency: 31 Hz – tuned for musical low-end extension and ground-shaking bass
• Port Area: 70 square inches
• Port Dimensions: 16″ x 4.375″
• Subwoofer Cutout Diameter: 11.01″ (per sub)
• Power Handling: Built to support up to 4000W RMS (2000W RMS per subwoofer)

Premium Materials & Precision Craftsmanship

• Material: Full 1” Russian Baltic Birch plywood – no MDF used
• Baffle Design: Solid 1” baffle with 24mm internal bracing for dual subwoofer setups
• Construction: Seamless, screwless exterior glued with Titebond III wood adhesive
• Finish: Carbon gray stain with polyurethane protective topcoat
• Wiring: Pre-wired with 10-gauge OFC speaker wire
• Terminal: Recessed satin nickel brass binding posts

Enclosure Dimensions

• Height: 18″
• Width: 38.625″
• Depth: 21.75″

Custom Build Timeline & Refund Policy

Lead Time: 2–3 weeks from order date
Policy: No refunds once the enclosure enters the cut-out phase (made-to-order)

Made in the USA – Basshead Supply Branded Series 🇺🇸

This dual 12" enclosure for Sundown Xv3 subwoofers is part of the Basshead Supply “Branded Series” — designed to meet the needs of serious bass enthusiasts. Each enclosure is handcrafted in the United States with unmatched attention to strength, precision, and detail.

Our refined screwless build process and premium-grade birch result in a lightweight yet rock-solid box that delivers deep, clean, and punchy bass. Whether you're building a demo vehicle or a loud daily driver, this high-performance dual 12" enclosure is built to outperform prefab boxes in every way.

Order today and give your Sundown Audio Xv3 12s the box they were born to slam in—built strong, wired right, and ready to perform.