Back-Loaded Horn Enclosure for Single 8″ Driver (Digital Plan) – 31Hz Tuning

This Back-Loaded Horn enclosure is engineered for extreme efficiency and competition-level SPL performance from a single 8-inch subwoofer. Designed around the Sundown Audio X-Series 8 or similar high-power, high-excursion drivers, this enclosure delivers output numbers that rival much larger systems.

Horn-loaded designs dramatically increase acoustic efficiency by converting cone motion into controlled, high-pressure output. The result is significantly higher SPL with less power compared to traditional sealed or ported enclosures—making this design ideal for competitors, demo vehicles, and serious bass enthusiasts.

Tuned to 31Hz, this enclosure focuses on strong low-frequency authority with aggressive projection. When tested, this design has been proven to achieve an SPL score of 139 dB at 36Hz, confirming its capability as a high-output competition enclosure.

External Dimensions

L × W × H: 28 ¾ in × 36 in × 8 ½ in

Horn Geometry Specifications

This enclosure features a precision-designed horn path optimized for efficiency and output:

• Throat: 7 ½ inches

• Neck: 11.6 inches (horn path transition section)

• Mouth: 9 ¾ inches

These dimensions are carefully calculated to support proper horn expansion, airflow control, and peak SPL performance in the intended frequency range.

Competition-Focused Performance

• Rear-loaded horn architecture for superior efficiency

• Proven 139 dB @ 36Hz SPL performance

• Designed for high-power 8″ subwoofers

• Optimized for competition and aggressive demo use

This is not a traditional daily-driver enclosure. It is purpose-built for those chasing maximum output, efficiency, and measurable results.

⚠️ Competition Use Only

This horn enclosure is intended for competition and demo applications. Proper amplifier tuning, filtering, and gain control are required. Continuous high-volume playback or improper setup may result in subwoofer damage. Recommended for experienced builders familiar with horn-loaded systems.

Digital Plan Includes

• Full cut sheets and panel dimensions

• Complete horn path layout

• Throat, neck, and mouth measurements

• 3D reference views for accurate construction

This digital plan is ideal for competitors and advanced builders looking to extract maximum SPL performance from a single 8-inch subwoofer using proven horn-loaded design principles.