SB Acoustics SB16PFCR25-4 Bass-midwoofer

The SB16PFCR25-4 Paper Bass-midwoofer from SB Acoustics is a meticulously engineered driver designed to deliver deep, controlled bass and articulate midrange performance in compact loudspeaker systems. This 176mm (6.5-inch) unit is an ideal choice for audiophiles and DIY enthusiasts seeking to build high-quality two-way or three-way designs, whether for bookshelf speakers, standmount monitors, or small floorstanding cabinets. Its well-balanced parameters also make it suitable for use as a dedicated midbass driver in multi-way configurations, ensuring seamless integration with tweeters and subwoofers.

Technically, this driver features a paper cone with a plastic basket, offering a natural, uncoloured sound signature. With a nominal impedance of 4 ohms and a DC resistance of 3.2 ohms, it is amplifier-friendly. The sensitivity of 89.5 dB (SPL 1m/2.83V) ensures efficient power handling, while the total Q factor (Qts) of 0.34, combined with a resonance frequency (Fs) of 35 Hz, enables tight, well-damped bass response. The maximum linear excursion (Xmax) of 4.5 mm allows for significant cone movement without distortion, and the low voice coil inductance (Le) of 0.56 mH contributes to extended high-frequency response. The SB16PFCR25-4 is a superb choice for those demanding precision and musicality from a compact bass-midwoofer.