Custom Enclosure for Sundown Audio Xv3 15" Subwoofer – 4.25 ft³ Ported Bass Box

Unleash serious low-end power with this handcrafted enclosure designed exclusively for the Sundown Audio Xv3 15" subwoofer. Engineered for massive output, precise tuning, and long-lasting strength, this box delivers powerful, clean bass with professional craftsmanship to match.

Performance Specifications – Xv3 15" Subwoofer Enclosure

• Net Internal Volume: 4.25 cubic feet
• Tuning Frequency: 30 Hz – optimized for deep, controlled bass response
• Port Area: 60 square inches
• Port Dimensions: 16″ x 3.75″
• Subwoofer Cutout Diameter: 14.01″
• Power Handling: Built to handle high-power systems (2000W RMS+)

High-Quality Construction & Premium Materials

• Material: Full 1” thick Russian Baltic Birch plywood
• Build Type: 17-ply birch veneer for maximum strength and acoustic performance
• Finish: Custom carbon gray stain with protective polyurethane topcoat
• Assembly: Screwless exterior construction with Titebond III adhesive for a clean, seamless look
• Pre-Wired: Equipped with 10-gauge OFC wire and recessed satin nickel brass binding posts

Box Dimensions

• Height: 18″
• Width: 31.5″
• Depth: 23″

Custom Built-to-Order – Lead Time & Return Policy

Build Time: 2–3 weeks from order confirmation
Refund Policy: No refunds after the cut-out process has started (custom product)

Built in the USA – Basshead Supply Branded Series 🇺🇸

This custom 15-inch subwoofer box is part of the Basshead Supply “Branded Series” — a line of handcrafted enclosures made to perfectly match specific subwoofer models like the Sundown Audio Xv3 15". Proudly built in the United States, these enclosures blend superior strength, sound quality, and visual appeal in one unbeatable package.

With full 1" birch construction, no visible hardware, and our signature carbon gray finish, this box is more than just a housing — it's a performance upgrade. Whether you’re chasing demo-worthy lows or looking for daily ground-pounding bass, this enclosure is up for the challenge.

Order now and give your Xv3 15" the box it deserves — custom-tuned, professionally built, and ready to drop jaws.