SB Acoustics SB13PFC25-4 5" Paper Cone Woofer

The SB13PFC25-4 5" Paper Cone Woofer from SB Acoustics is a meticulously engineered driver designed to deliver tight, controlled bass within a compact footprint. As part of the acclaimed PFC Paper series, this woofer combines traditional materials with modern acoustic science to produce a natural, uncoloured sound that integrates seamlessly into high-fidelity systems.

This versatile driver excels in a range of applications, from two-way bookshelf speakers to dedicated subwoofer enclosures. Its low total Q factor of 0.29 makes it particularly well-suited for sealed box designs, where it can achieve deep, accurate low-frequency extension without boominess. It also performs admirably in ported enclosures, offering flexibility for custom builds. Whether used as a dedicated bass driver or a mid-bass unit in a multi-way system, the SB13PFC25-4 provides a solid foundation for critical listening.

Technically, the woofer features a 127 mm paper cone with a 25.4 mm voice coil, ensuring excellent transient response and low distortion. With a sensitivity of 89 dB (1m/2.83V) and a resonance frequency of 44 Hz, it balances efficiency with depth. The electrical Q (Qes) of 0.33 and mechanical Q (Qms) of 2.6 contribute to its precise damping, while a maximum linear excursion (Xmax) of 4.5 mm allows for dynamic playback. The 4-ohm impedance and 3.2-ohm DC resistance simplify amplifier matching.

In summary, the SB13PFC25-4 is a refined choice for audiophiles and DIY enthusiasts seeking a compact yet capable woofer that delivers accurate, controlled bass with the natural warmth characteristic of paper cones.