GRS 5SMP-4 Bass-midwoofer

The GRS 5SMP-4 Bass-midwoofer is a meticulously engineered driver designed to deliver accurate and controlled bass and midrange reproduction for discerning audio enthusiasts. This versatile 5-inch unit serves as an ideal foundation for high-fidelity two-way or three-way speaker systems, offering a balanced performance that suits both custom DIY projects and replacement applications in existing enclosures. Its robust construction and carefully tuned parameters make it particularly well-suited for sealed or ported designs where precise transient response and low distortion are paramount.

Technically, the 5SMP-4 features a lightweight yet rigid polypropylene cone paired with a durable rubber surround, ensuring excellent damping and long-term reliability. The ferrite magnet motor system, combined with a steel basket, provides a solid platform for controlled cone movement. Key specifications include a sensitivity of 88.8 dB SPL at 1m/2.83V, a total Q factor (Qts) of 0.54, and a maximum linear excursion (Xmax) of 2 mm. The voice coil inductance is a low 0.58 mH, contributing to extended high-frequency response, while the DC resistance (Re) of 3.7 ohms allows for efficient power handling. With a nominal diameter of 133.4 mm and four mounting holes, this driver integrates seamlessly into standard enclosures. Whether you are building a compact bookshelf speaker or a dedicated midbass module, the GRS 5SMP-4 offers a compelling blend of performance and value.