B&amp;C 18SW115-4 18-Inch Neodymium Subwoofer - Set of 1<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>B&amp;C"s 18SW115 18" pro subwoofer speaker boasts an oversized 4.5" voice coil， neodymium motor， 1，700 watts RMS Power handling capacity， and 14 mm Xmax (60 mm peak-to-peak excursion before damage). 4OHM</li><li>4.5" split winding copper voice coil on fiberglass former， Ventilated voice coil gap reduces Power compression. Aluminum demodulation ring on pole piece reduces distortion. Double silicone spider</li><li>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</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41ZGrOQz0fL.jpg" noproxy>