8 × 8″ Subwoofer Enclosure – 35Hz | 8.0 cu. ft. Gross / 5.0 cu. ft. Net | Subs Up • Port Back

Take your bass system to the next level with this extreme 8-driver subwoofer enclosure, engineered specifically for eight Sundown Audio SA-8 v.3 subwoofers or similar high-performance 8-inch drivers. Designed to maximize efficiency, airflow, and output, this enclosure delivers the cone area of much larger systems while maintaining the speed and responsiveness that 8-inch subwoofers are known for.

Featuring a Subs Up / Port Back configuration, this enclosure is optimized for strong cabin loading and exceptional low-frequency output. Tuned to 35Hz, it provides a hard-hitting balance of musical bass response and competition-inspired SPL performance, making it ideal for daily listening, demos, and high-output show vehicles.

With a gross internal volume of 8.0 cubic feet and 5.0 cubic feet net volume, this design provides the airspace required for eight high-performance 8-inch subwoofers to operate efficiently while maintaining excellent control and power handling.

When paired with proper amplification and tuning, this enclosure is capable of supporting systems exceeding 5,000 watts RMS and delivering 140+ decibel performance, making it a serious option for bass enthusiasts looking to stand out from traditional subwoofer builds.

Enclosure Specifications

• Enclosure Type: Vented / Ported
• Configuration: Subs Up • Port Back
• Tuning Frequency: 35Hz
• Gross Internal Volume: 8.0 cu. ft.
• Net Internal Volume: 5.0 cu. ft.
• Construction Material: ¾″ MDF
• Subwoofer Compatibility: Eight Sundown Audio SA-8 v.3 subwoofers or similar 8″ drivers

Heavy-Duty Construction

Built to withstand the demands of eight high-output subwoofers, this enclosure incorporates premium reinforcement features throughout the design.

Double Front Baffle

A reinforced double-thickness mounting surface provides exceptional strength and stability for all eight subwoofers, helping reduce vibration while maintaining a secure mounting platform under extreme excursion.

Extensive Window Bracing

The enclosure utilizes extensive internal window bracing to:

• Minimize panel flex
• Increase overall structural rigidity
• Maintain enclosure integrity under extreme pressure
• Improve acoustic efficiency and output consistency

This reinforcement allows the enclosure to remain solid and responsive, even when driven by thousands of watts of power.

Performance Features

• Designed for eight 8-inch subwoofers
• Tuned to 35Hz for powerful, musical bass response
• Subs Up / Port Back configuration
• Supports 5,000+ watts RMS
• Capable of 140+ dB output
• Double-baffle construction for maximum durability
• Extensive internal window bracing
• Optimized for high-output daily listening and demo systems
• Excellent blend of efficiency, output, and musicality

Ideal For

• High-output daily driver systems
• Demo and show vehicles
• Bass enthusiasts seeking something unique
• Multi-subwoofer builds focused on efficiency and SPL
• Users looking to maximize cone area without moving to larger drivers

This enclosure is designed for enthusiasts who want the impressive output of a large multi-subwoofer system while maintaining the fast response and musical characteristics that make 8-inch drivers so enjoyable. With its 35Hz tuning, 5.0 cubic feet net volume, double-baffle construction, and extensive window bracing, this enclosure is built to deliver exceptional performance from eight Sundown Audio SA-8 v.3 subwoofers or similar drivers.