Phoenix Gold ZX210PBSi 700W Down-Firing Slim Dual 10? Subwoofer Enclosure – 2? Big bass in a small box. The Phoenix Gold ZX210PBSi is a compact, high-performance down-firing subwoofer enclosure designed to deliver deep, controlled bass while saving valuable boot space. Perfect for modern vehicles where space is limited but sound quality matters. Powerful, Compact & Precise Bass Performance. The ZX210PBSi features a down-firing sealed enclosure that takes advantage of natural. Using the vehicle floor to enhance low-frequency response. This intelligent design produces deeper, cleaner bass with excellent punch and clarity. An integrated passive radiator extends low-frequency output without the distortion commonly associated with ported enclosures, ensuring smooth, musical bass at all listening levels. Engineered for Reliability & Everyday Use. Built from robust materials with internal reinforcement, the Phoenix Gold ZX210PBSi is designed for long-term reliability. Whether installed in the boot or a tight space, it remains solid, cool, and distortion-free even under demanding conditions. Practical touches such as removable Phoenix Gold branded feet and Velcro carpet grips keep the enclosure securely in place, preventing movement during driving. Dual 10? Down-firing subwoofers. Integrated passive radiator for deeper bass extension. Slim sealed enclosure for tight, accurate bass. Optimised for small to medium monoblock amplifiers. New subwoofer design for improved performance. Rounded enclosure corners for a premium finish. Aluminium Phoenix Gold logo plate. Removable feet with PG branding. Velcro feet to prevent sliding on carpeted boots. Dimensions (L × W × H). 650 × 320 × 140 mm. Vehicles with limited boot space. Daily drivers wanting strong, clean bass. Compact and stealth audio installations. Pairing with low to mid-power mono amplifiers. Why Choose Phoenix Gold? With decades of audio engineering heritage, Phoenix Gold is renowned for producing reliable, great-sounding car audio products. The ZX210PBSi continues this legacy by combining smart design, premium materials, and outstanding bass performance in a compact form factor. Upgrade your car audio system today with the Phoenix Gold ZX210PBSi and enjoy powerful, accurate bass without sacrificing space.