Dual Sundown Audio SA Classic 12" 4th Order Blow‑Thru Subwoofer Box Plans
Subwoofer Box Plans for (2) Sundown Audio SA Classic 12" – 4th Order Blow‑Thru Enclosure
Build a violently powerful, competition‑ready 4th order blow‑thru enclosure for two Sundown Audio SA Classic 12" subwoofers with these precision‑engineered subwoofer box plans. Designed to unleash the SA Classic’s legendary low‑end authority, smooth bandwidth, and high‑efficiency performance, this enclosure delivers massive cabin pressure, strong upper‑bass output, and the signature Sundown sound.
The SA Classic thrives in 4th order designs thanks to its balanced motor force and suspension, and this enclosure provides the ideal sealed‑to‑ported ratio, port area, and tuning frequency needed to maximize output while maintaining clean, musical response.
Save Money — Build It Yourself
Stop wasting materials and guessing on dimensions. These DIY subwoofer box plans make it simple to build a professional‑grade blow‑thru enclosure at home — perfect for anyone wanting competition‑level output without paying custom‑shop prices.
What’s Included
- Downloadable ZIP file
- Multiple 3D rendering images
- Detailed spec sheet with subwoofer & enclosure specs
- Professional optimized cut sheet with parts list
- Precision‑designed 4th order blow‑thru enclosure layout
Designed For
Dual Sundown Audio SA Classic 12" Subwoofers – 4th Order Blow‑Thru Application
- Woofer Type: (2) Sundown Audio SA Classic 12
- Woofer Size: 12"
- Outside Dimensions: 16”H x 30”W x 36”D
- Tuning: 28hz-56hz
- Performance Notes: Engineered for violent low‑end output, strong upper‑bass efficiency, and clean daily performance
May work for other 12" woofers — user discretion advised.
Why These Plans Perform
- Optimized specifically for dual Sundown SA Classic 12s
- 4th order design delivers massive output and wide usable bandwidth
- Blow‑thru layout maximizes cabin pressure and real‑world SPL
- Smooth, predictable response thanks to proper sealed/ported ratio
- Ideal for high‑output daily builds and competition‑style setups
- Eliminates trial‑and‑error and prevents wasted materials