Custom Enclosure for Sundown Audio NSv6 18" Subwoofer – 7.0 ft³ Ported High-Power Box

Engineered exclusively for the Sundown Audio NSv6 18" subwoofer, this handcrafted ported enclosure from Basshead Supply is tuned for extreme low-end performance, powerful output, and long-term reliability. Designed for those who push serious power, this box is ready to perform in high-demand SPL and daily setups.

Performance Specifications – NSv6 18" Subwoofer Box

• Net Internal Volume: 7.0 cubic feet
• Tuning Frequency: 30 Hz – ideal for deep, chest-thumping lows
• Port Area: 95.64 square inches
• Port Dimensions: 18″ x 5.33″
• Subwoofer Cutout Diameter: 17.01″
• Power Handling: Built to support extreme high-output systems (3000W+ RMS)

Premium Materials & High-Strength Construction

• Material: Full 1” Russian Baltic Birch plywood – no MDF used
• Construction: 17-ply birch veneer for exceptional strength and acoustic stability
• Finish: Carbon gray stain sealed with a protective polyurethane coating
• Assembly: Seamless screwless design bonded with Titebond III wood glue
• Wiring: Prewired with 10-gauge OFC speaker wire
• Binding Posts: Recessed satin nickel brass terminal cup

Enclosure Dimensions

• Height: 20″
• Width: 39.75″
• Depth: 24.625″

Build Timeline & Refund Policy

Lead Time: 2–3 weeks from order date
Refunds: Not available after cut-out process begins (custom product)

Built in the USA – Basshead Supply Branded Series 🇺🇸

This custom 18" enclosure for the Sundown Audio NSv6 is part of our Branded Series — engineered, tuned, and handcrafted in the United States for bass lovers who expect nothing less than top-tier performance. Every box is assembled with care, tuned to perfection, and made to last.

With rugged 1" birch construction, massive port area, and a sleek carbon gray finish, this enclosure is ideal for both SPL competitors and daily drivers who demand more from their bass system. From street setups to sound-offs, it’s built to dominate.

Order today and experience unmatched power, tone, and reliability in a box designed for the monster that is the NSv6 18".