2017-2025 Ford F250-350 Crew Quad Sundown Audio SA 6.5" Subwoofer Box Plans
Subwoofer Box Plans for (4) Sundown Audio SA 6.5" – Ported Truck Enclosure
Build a tight, punchy, and surprisingly deep‑hitting ported enclosure for four Sundown Audio SA 6.5" subwoofers with these precision‑engineered subwoofer box plans designed specifically for the 2017-2025 Ford F250-350 Crew Cab. This enclosure maximizes every cubic inch of under‑seat airspace while maintaining full rear‑seat functionality.
The SA 6.5 is known for its impressive output, fast transient response, and strong low‑end performance for its size. This enclosure provides the ideal airspace, port area, and tuning frequency needed to deliver tight, musical, and powerful bass inside the F150 cabin — perfect for daily listening with excellent clarity and punch.
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 — perfect for anyone wanting clean, high‑quality bass 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 ported truck enclosure layout
Designed For
Quad Sundown Audio SA 6.5" Subwoofers – 2017-2025 Ford F250-350 Crew Cab
- Woofer Type: (4) Sundown Audio SA 6.5
- Woofer Size: 6.5"
- Outside Dimensions: 9”FH x 6”RH x 54 1/16”W x 15”D
- Requires NO SEAT LIFT
- Tuning: 32Hz truck‑optimized ported design
- Performance Notes: Engineered for tight, accurate bass with strong mid‑bass punch and excellent in‑cabin efficiency
May work for other 6.5" woofers — user discretion advised.
Why These Plans Perform
- Optimized specifically for quad Sundown SA 6.5s
- Designed to fit 2017-2025 Ford F250-350 Crew Cab with proper seat lift
- Ported layout maximizes airflow and reduces turbulence
- Smooth, predictable response thanks to proper port tuning
- Ideal for daily setups needing clean, musical, and punchy bass with surprising output
- Eliminates trial‑and‑error and prevents wasted materials