GRS 12SMP-4 Bass-midwoofer

The GRS 12SMP-4 12-inch surface-mount polycone woofer delivers deep, controlled bass and articulate midrange performance, making it an exceptional choice for custom audio builds. Engineered for effortless integration, this driver is ideal for car audio upgrades, home theatre subwoofer systems, and professional sound reinforcement where space is at a premium. Its surface-mount design simplifies installation, allowing you to achieve impressive low-frequency extension without the need for complex enclosure modifications.

Technically, the woofer features a polycone diaphragm that combines rigidity with lightweight construction, ensuring accurate transient response and reduced distortion. With a sensitivity of 91.9 dB SPL at 1m with 2.83V, it offers high efficiency for powerful output from modest amplifier power. The total Q factor of 0.51 indicates a well-damped response suitable for sealed or ported enclosures, while the 5.5 mm Xmax provides substantial linear excursion for impactful bass. The 3.9 ohm DC resistance and 0.41 mH voice coil inductance contribute to stable electrical performance, and the 284 mm cutout diameter with a 319 mm bolt circle accommodates straightforward mounting. With a depth of 136 mm, this woofer fits neatly into shallow installations. Whether you are building a high-fidelity sound system or a dedicated subwoofer, the GRS 12SMP-4 offers reliable, room-filling performance at an accessible price point.