2019–2025 GM Crew Cab Dual Sundown Audio X v3 8" Subwoofer Box Plans
Subwoofer Box Plans for (2) Sundown Audio X v3 8" – Ported Truck Enclosure
Build a violently strong, deep‑tuned ported enclosure for two Sundown Audio X v3 8" subwoofers with these precision‑engineered subwoofer box plans designed specifically for the 2019–2025 Chevy Silverado & GMC Sierra Crew Cab. This enclosure maximizes under‑seat airspace, airflow efficiency, and low‑end extension while maintaining full rear‑seat functionality.
The X v3 8 is known for its massive motor structure, extreme excursion capability, and shockingly deep output for an 8" driver. This enclosure provides the ideal airspace, port area, and tuning frequency needed to deliver crushing lows, strong cabin gain, and clean daily performance inside the GM truck cabin.
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 huge, clean 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 X v3 8" Subwoofers – 2019–2025 GM/Chevy/GMC Crew Cab
- Woofer Type: (2) Sundown Audio X v3 8
- Woofer Size: 8"
- Outside Dimensions: FH8 15/16” x RH6” x W52 1/2” x D15”
- Requires NO Seat Lift
- Tuning: 33Hz truck‑optimized ported design
- Performance Notes: Engineered for extreme low‑end output, strong cabin gain, and clean daily performance
May work for other 8" woofers — user discretion advised.
Why These Plans Perform
- Optimized specifically for dual Sundown X v3 8s
- Designed to fit 2019–2025 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 extremely powerful bass
- Eliminates trial‑and‑error and prevents wasted materials