Subwoofer Box Plans for (2) Sundown Audio Xv3 15s – 4th Order Blow‑Through Enclosure Build a powerful, high‑output 4th order blow‑thru box for your Sundown Audio Xv3 15s with these precision‑designed subwoofer box plans. Whether you're building a blow‑through truck setup or a serious SPL system, these plans give you the accuracy, tuning, and performance needed for deep lows, clean output, and extreme cabin pressure. See Real‑World Performance: Check out a customer build using this exact design: https://www.customlows.com/post/customer-submission-loud-and-clean-sundown-audio-xv3-15s-blow-thru

Save Money — Build It Yourself Skip the guesswork and wasted materials. These DIY subwoofer box plans make it easy to build a professional‑grade enclosure at home. Perfect for anyone wanting maximum bass without paying custom‑shop prices.

What’s Included - Downloadable ZIP file - Multiple 3D rendering images - Detailed spec sheet with subwoofer & enclosure specs - Professional cut sheet with parts list - Precision‑designed 4th order blow‑through layout

Designed For (2) Sundown Audio Xv3 15s — 4th Order Blow‑Thru - Outside Dimensions: 20”H × 48”W × 36”D - Tuning: 54Hz - Net Volume After Displacement: 4.17 / 9.18 cu ft - Based on manufacturer‑recommended specs May work for other 15" woofers — user discretion advised.

Why These Plans Perform - Optimized for Sundown Xv3 15s - Designed for strong low‑end extension and clean upper‑bass response - Ideal for blow‑through truck builds - Smooth, predictable response thanks to proper 4th order design - Eliminates trial‑and‑error and wasted materials