2008–2018 GM Crew Cab Dual Sundown Audio SA v3 8" Subwoofer Box Plans
Subwoofer Box Plans for (2) Sundown Audio SA v3 8" – Ported Truck Enclosure
Build a tight, punchy, and surprisingly deep‑hitting ported enclosure for two Sundown Audio SA v3 8" subwoofers with these precision‑engineered subwoofer box plans designed specifically for the 2008–2018 Chevy Silverado & GMC Sierra Crew Cab. This enclosure maximizes every cubic inch of under‑seat airspace while maintaining full rear‑seat usability.
The SA v3 8 is known for its improved motor design, stronger low‑end authority, and excellent daily performance. This enclosure provides the ideal airspace, port area, and tuning frequency needed to deliver tight, musical, and powerful bass inside the GM truck cabin — perfect for daily listening with impressive 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
Dual Sundown Audio SA v3 8" Subwoofers – 2008–2018 GM/Chevy/GMC Crew Cab
- Woofer Type: (2) Sundown Audio SA v3 8
- Woofer Size: 8"
- Outside Dimensions: FH9” x RH6” x W54” x D15”
- Requires NO Seat Lift
- Tuning: 34–36Hz 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 8" woofers — user discretion advised.
Why These Plans Perform
- Optimized specifically for dual Sundown SA v3 8s
- Designed to fit 2008–2018 GM 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