Your #1 Source for Audio, Video and Speaker Building Components. B&C 18SW115-4 18 Professional Neodymium Subwoofer 4 Ohm. An aluminum demodulation ring fitted to the 18SW115-4’s pole piece reduces distortion. Lightweight but powerful FEA-optimized neodymium magnet. Extremely high BL factor and Xmax for outstanding LF output. 14 mm Xmax, 60 mm peak-to-peak excursion before damage. […]... Read More