SB Acoustics SB15MFC30-8 Bass-midwoofer

The SB Acoustics SB15MFC30-8 Polypropylene Bass-midwoofer delivers a refined balance of clarity and warmth, making it an excellent choice for audiophiles and DIY speaker builders alike. Engineered for high-fidelity two-way or three-way designs, this driver excels at reproducing both bass and midrange frequencies with natural, uncoloured precision. Whether you are constructing a compact bookshelf speaker or a more elaborate floor-standing system, this woofer integrates seamlessly to provide a cohesive and immersive listening experience.

At the heart of its performance lies a 127 mm polypropylene cone, chosen for its low distortion and consistent behaviour across the frequency range. The cast aluminium basket ensures exceptional rigidity and reduces unwanted resonances, while the 5 mm linear excursion (Xmax) allows for controlled, dynamic bass output. With a sensitivity of 87 dB and a total Q factor of 0.37, the driver is well-suited to both sealed and ported enclosures. The low voice coil inductance of 0.14 mH and a DC resistance of 5.7 ohms contribute to excellent transient response and efficient power handling. Mechanical and electromagnetic Q values of 4.4 and 0.4 respectively further underline its precise damping characteristics. Finished with a robust build and a depth of just 79 mm, this SB Acoustics woofer is a reliable foundation for any serious loudspeaker project.