B&C 18TBW100 18-Inch VC Car and DJ Subwoofer B&C 18TBW100 18" Professional Subwoofer 8 Ohm High BL motor for impressive control and massive Split winding 4&quot; voice coil handles 1,500 Aluminum demodulating ring reduces distortion Under-spider venting for maximum power handling Capable of producing big sound when loaded in small High BL motor for impressive control and massive Split winding 4&quot; voice coil handles 1,500 Aluminum demodulating ring reduces distortion Under-spider venting for maximum power handling Capable of producing big sound when loaded in small