GRS 4SMP-4 Bass-midwoofer

The GRS 4SMP-4 Bass-midwoofer is a meticulously engineered 4-inch driver designed to deliver articulate, detailed low-frequency and midrange performance in compact loudspeaker systems. Its polypropylene cone and rubber surround work in concert to provide controlled, low-distortion reproduction, making it an ideal choice for high-fidelity audio projects where space is at a premium.

This versatile bass-midwoofer excels in a variety of applications, including bookshelf speakers, small floor-standing designs, and multi-channel home theatre setups. Its balanced response also suits it for use in active two-way systems or as a dedicated mid-bass driver in three-way configurations, where clarity and transient accuracy are paramount.

Technically, the 4SMP-4 features a 101.6 mm nominal diameter with a 4 mm linear excursion (Xmax) and a displacement volume (Vd) of 21, ensuring robust bass output. Its impedance is 4 ohms with a DC resistance of 3.7 ohms, while sensitivity is rated at 86 dB SPL at 1m/2.83V. The total Q factor (Qts) of 0.55, derived from a mechanical Q (Qms) of 3.05 and an electrical Q (Qes) of 0.67, indicates a well-damped alignment suitable for sealed or ported enclosures. A low voice coil inductance (Le) of 0.32 mH contributes to extended high-frequency response. The driver is built with a ferrite magnet, a steel basket, and a rubber surround, ensuring durability and consistent performance.

In summary, the GRS 4SMP-4 offers a compelling combination of compact dimensions, refined technical specifications, and reliable construction, making it a superb choice for discerning audio enthusiasts seeking to build high-quality, space-efficient loudspeakers.