5 Inch Paper Cone Passive Radiator

A dedicated passive radiator unit for enhancing subwoofer enclosure performance in automotive audio applications. This 5-inch model uses a paper cone diaphragm known for its balanced stiffness-to-damping ratio, contributing to smoother frequency roll-off above the tuning range. Built with a combination of plastic and metal components — the cone and surround are paper-based and reinforced, while the frame and suspension structure integrate metal elements for rigidity and longevity. Dimensions: outer diameter 147 mm (5.7 in), required cutout 132 mm (5.1 in), diagonal mounting hole spacing 138 mm (5.4 in). Supplied as a single pair (2 units), black finish, no magnets or electronics included. Unlike active drivers, this unit relies entirely on rear-wave pressure from a primary subwoofer driver to move air. It enables deeper bass extension with lower distortion and reduced wind noise versus ported designs — particularly valuable in shallow-mount or under-seat enclosures where port length would be impractical. Typical application: Integrated into custom-built or modified sealed sub enclosures to replace or supplement port tuning — preferred by UK car audio builders seeking tighter, faster, and more linear low-end response in hatchbacks, saloons, and compact SUVs.