Quad Sundown Audio X 12" 4th Order Bandpass Subwoofer Box Plans
Subwoofer Box Plans for (4) Sundown Audio X Series 12" – 4th Order Bandpass Enclosure
Build an extreme‑output, deep‑hitting 4th order bandpass enclosure for four Sundown Audio X Series 12" subwoofers with these precision‑engineered subwoofer box plans. Designed for massive low‑frequency authority, wide‑bandwidth performance, and aggressive airflow, this enclosure unleashes the full potential of the X Series — known for its monstrous motor force and high‑power handling.
Perfect for demo builds, high‑power daily setups, and anyone wanting chest‑crushing bass in a compact footprint.
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 enclosure at home, giving you competition‑level performance 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 bandpass layout
Designed For
Quad Sundown Audio X Series 12" Subwoofers – 4th Order Bandpass Enclosure
- Woofer Type: (4) Sundown Audio X Series 12
- Woofer Size: 12"
- Outside Dimensions: 34"W × 17"H × 38"D
- Tuning: 4th order bandpass (sealed + ported chambers engineered to manufacturer specs)
- Performance Notes: Built for extreme output, deep low‑frequency punch, and wide‑bandwidth response with excellent cone control
May work for other 12" woofers — user discretion advised.
Why These Plans Perform
- Optimized specifically for four Sundown X Series 12" subs
- 4th order design delivers massive output and strong low‑end authority
- Wide bandwidth response for loud, clean, musical performance
- Engineered for high‑power daily setups and demo‑style builds
- Smooth, predictable response thanks to properly balanced sealed and ported chambers
- Eliminates trial‑and‑error and prevents wasted materials