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Sundown Audio

Sundown Audio Single 18" NSv6 Ported Enclosure - AABE-SA-NSv6-S18SUPB-HD

Sundown Audio Single 18" NSv6 Ported Enclosure - AABE-SA-NSv6-S18SUPB-HD

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Sundown Audio Single 18" NSv6 Ported Enclosure - AABE-SA-NSv6-S18SUPB-HD

Custom built enclosure specifically for the Sundown Audio NSv6 18" subwoofer. Lead time is 2-3 weeks, no refunds once enclosures have been cut out! This is a custom made box specifically for the Sundown Audio NSv6 18" subwoofer. At Basshead Supply the goal with the “branded series” enclosures is to offer subwoofer specific enclosures that are well built, well performing and good looking enclosures at an affordable price. Using premium 1” Baltic Birch all around we are able to achieve a very strong and light enclosure. Using our refined assembly process produces an enclosure with NO visible screw holes anywhere on the enclosure. The entire enclosure is glued together with Titebond III and coupled with our 1” baffle and an additional 24mm baffle brace (on the dual subwoofer models) the enclosure is strong enough to handle high power subwoofer setups. Finished off with our carbon gray stain and a polyurethane finish these enclosures have a unique look to set it apart from all the generic prefabs. Complete with a recessed Satin Nickel Brass binding posts and prewired with OFC 10g wire, you are ready to go the moment it arrives. These are also built with love, by hand right here in the UNITED STATES OF AMERICA.

Specifications
  • 7.0 cubic feet net enclosure
  • 30 hz tuning
  • 95.64 sq inches of port
  • 18" x 5.33" port dimensions
  • 17.01" subwoofer cut out
  • Entire enclosure 1" birch ply
  • 17 ply birch veneer construction
  • Gray stained finish
  • Pre-wired metal binding post
Dimensions
  • 20" tall
  • 39.75" wide
  • 24.625″ deep
What Our Experts Think
  • Designed for the NSv6 Platform – Engineered specifically to maximize the performance of a single 18-inch Sundown Audio NSv6 subwoofer.
  • Extreme Output Ported Design – Delivers massive low-frequency extension, exceptional efficiency, and powerful bass impact.
  • Precision-Tuned for Maximum Performance – Optimized enclosure volume and port configuration help unlock the full potential of the NSv6 series.
  • Built for High-Power Systems – Designed to handle the extreme excursion and power demands of Sundown’s flagship subwoofers.
  • Heavy-Duty Construction – Reinforced enclosure design minimizes flex and unwanted resonance for cleaner, tighter bass reproduction.
  • Expert Choice for Competition-Level Bass – Ideal for enthusiasts seeking maximum SPL potential, deep sub-bass response, and professionally engineered enclosure performance.
Q&A

Q: What is the Sundown Audio Single 18" NSv6 Ported Enclosure designed for?
A: It is a heavy-duty ported enclosure engineered specifically for one 18-inch Sundown Audio NSv6 subwoofer to maximize bass output and low-frequency performance.

Q: Why choose an 18-inch ported enclosure?
A: The large driver size combined with a tuned ported design delivers deeper bass, higher efficiency, and extreme output capability.

Q: Is this enclosure designed specifically for the NSv6 subwoofer?
A: Yes, it is optimized to match the airspace and tuning requirements of the Sundown Audio NSv6 18-inch subwoofer.

Q: What type of bass performance can I expect?
A: Expect massive low-frequency output, deep bass extension, and high SPL capability for serious car audio enthusiasts.

Q: Is the enclosure pre-built and ready to install?
A: Yes, it comes professionally assembled and ready for subwoofer installation.

Q: What materials are used in the enclosure?
A: It is constructed from heavy-duty MDF with reinforced internal bracing for maximum strength, durability, and vibration control.

Q: Does the enclosure improve subwoofer performance?
A: Yes, the tuned ported design helps maximize output, efficiency, and overall bass response.

Q: Is this enclosure suitable for high-power audio systems?
A: Yes, it is built to support the extreme power handling and long-excursion capabilities of the Sundown Audio NSv6 series.

Q: Can it be used for SPL-focused builds?
A: Yes, it is an excellent choice for competition-oriented SPL systems and high-output daily driver setups.

Q: Is professional installation recommended?
A: Yes, professional installation is recommended to ensure proper mounting, wiring, and system tuning for optimal performance.

Maintenance Tips
  • Inspect the enclosure regularly for loose screws, cracks, or signs of structural damage.
  • Tighten all subwoofer mounting hardware periodically to prevent vibrations and maintain an airtight seal.
  • Check speaker wire and terminal connections for wear, corrosion, or loose contacts.
  • Keep the enclosure clean, dry, and free from dust, dirt, and debris buildup.
  • Avoid prolonged exposure to direct sunlight, excessive heat, or moisture.
  • Inspect the port opening regularly and remove any obstructions that may restrict airflow.
  • Operate the subwoofer within recommended power ratings to ensure reliable long-term performance.
  • Listen for rattles, vibrations, or air leaks and address any issues promptly to maintain optimal bass response and sound quality.