B&C 15SW115 is a lightweight very high power 15" woofer for speaker subwoofer systems with a 4.5 inch split winding voice coil. B&C 15SW115 Speakers - B&C 15" 15SW115 high power speaker
B&C 21SW152-4 21" Neodymium Subwoofer 4 Ohm
Test Bench: The 15DS100 15” Pro Sound Subwoofer from B&C Speakers | audioXpress
Amazon.com: B&C 15TBX100 Studio Subwoofer : Musical Instruments
B&C 18TBX100 18 inch Subwoofer for sale online | eBay
B&C 18NBX100 18" Professional Neodymium Subwoofer 8 Ohm - Walmart.com