SB Acoustics SB12PFC-00 4'' Passive Radiator

The SB12PFC-00 4-inch Passive Radiator from SB Acoustics is a high-quality component designed to enhance low-frequency performance in compact loudspeaker systems. As a passive radiator, it replaces a port in a sealed enclosure, allowing for deeper, more controlled bass extension without the turbulence or chuffing noise associated with conventional reflex ports. This makes it an ideal choice for designers seeking to maximise output from a small cabinet, whether in a bookshelf speaker, a subwoofer, or a bespoke audio project.

This unit features a paper cone made from natural fibre, which delivers a smooth, natural, and articulate bass response. The high-compliance suspension, indicated by a mechanical compliance (Cms) of 1.2 mm/N, ensures excellent low-frequency extension, while the low mechanical losses (Rms of 0.32) contribute to efficient energy transfer and clean sound reproduction. With a resonance frequency (Fs) of 34 Hz and a maximum linear excursion (Xmax) of 9 mm, the SB12PFC-00 can handle significant cone movement, producing deep, impactful bass even in small enclosures. The effective cone area (Sd) of 50 cm² ensures adequate air displacement for its size.

Engineered as part of SB Acoustics’ PFC Paper series, this passive radiator is built to exacting standards, offering reliable performance and seamless integration into your loudspeaker design. Whether you are upgrading an existing system or building from scratch, the SB12PFC-00 provides a refined solution for achieving extended low-frequency response with natural, uncoloured sound.