GRS 12SMP-8 Bass-midwoofer

The GRS 12SMP-8 is a 12-inch surface-mount polycone woofer engineered to deliver deep, articulate bass without demanding excessive enclosure volume. This driver excels in high-fidelity mid-bass and subwoofer applications, making it an excellent choice for audiophiles seeking to upgrade existing systems or build custom loudspeakers. Its versatility suits both home audio and professional installations where controlled, low-distortion performance is paramount.

Technically, the woofer features a 50mm aluminium voice coil former, ensuring efficient heat dissipation and reliable high-power handling. With a total Q factor (Qts) of 0.56 and a resonance frequency (Fs) of just 28 Hz, it is optimised for sealed and ported enclosures, delivering extended low-frequency response. The polycone diaphragm combines stiffness with light weight, contributing to a sensitivity of 89.5 dB (1m/2.83V) and a maximum linear excursion (Xmax) of 5.5 mm. Additional specifications include a DC resistance (Re) of 5.8 ohms, voice coil inductance (Le) of 0.54 mH, and equivalent volume (Vas) of 127.4 litres. The mechanical (Qms) and electrical (Qes) Q factors are 3 and 0.68 respectively, while the suspension compliance (Cms) is 0.34 mm/N. This combination ensures precise transient response and deep, impactful bass, making the GRS 12SMP-8 a compelling choice for discerning listeners.