SB Acoustics SB12PFC25-8 Bass-midwoofer

The SB12PFC25-8 4'' Mid-Woofer from SB Acoustics is a precision-engineered driver designed to deliver accurate mid-bass reproduction in compact loudspeaker systems. As part of the esteemed PFC Paper series, this unit combines traditional materials with modern acoustic engineering to provide a natural, controlled sound character. Whether you are building a high-fidelity two-way bookshelf speaker, a dedicated centre channel, or a satellite subwoofer system, this driver excels in sealed enclosures where tight, articulate bass is required. Its modest dimensions make it an ideal choice for space-conscious designs without compromising on performance.

Technically, the SB12PFC25-8 features a paper cone renowned for its low coloration and excellent damping properties, paired with a 25.4mm voice coil that ensures efficient power handling and low distortion. With a total Q factor (Qts) of 0.56 and a resonance frequency (Fs) of 64 Hz, it is well-suited to sealed box alignments, offering a smooth roll-off and extended low-frequency response. The 5mm linear excursion (Xmax) allows for meaningful output at moderate volumes, while the 8-ohm impedance simplifies system integration. Sensitivity is rated at 84.5 dB (1m/2.83V), and the low voice coil inductance (Le) of 0.36 mH contributes to excellent high-frequency extension, making this driver a versatile performer for discerning audio enthusiasts.