SB Acoustics SB12NRXF25-8 Bass-midwoofer

The SB12NRXF25-8 Norex Bass-midwoofer from SB Acoustics is a compact yet powerful driver designed to deliver deep, controlled bass and articulate midrange performance. Its 4-inch frame makes it an ideal choice for space-conscious audio projects, including bookshelf speakers, small subwoofer systems, or high-fidelity two-way designs where precise low-frequency extension is required without sacrificing cabinet volume.

This bass-midwoofer excels in sealed and ported enclosures, thanks to its total Q factor of 0.42, which offers versatile tuning options for balanced, accurate sound reproduction. With a sensitivity of 85 dB and a maximum power handling of 30W, it pairs well with modest amplification while maintaining clarity and dynamic range. The 8-ohm impedance ensures compatibility with a wide range of amplifiers and crossover networks.

Technically, the SB12NRXF25-8 features a low DC resistance of 6.4 ohms and a voice coil inductance of just 0.34 mH, contributing to controlled transient response and reduced distortion. The mechanical Q of 5.4 and electromagnetic Q of 0.46 further refine its damping characteristics, while the 0.4 kg/m mechanical loss factor ensures smooth operation. With a mounting depth of only 69.8 mm and a cutout diameter of 101.6 mm, this driver is straightforward to integrate into compact enclosures. Whether for a bespoke hi-fi system or a custom subwoofer, the SB12NRXF25-8 delivers reliable, high-quality bass and midrange performance.