Martin Audio Set of 2 pcs PSX 15" Subwoofer + 2 pcs X12B speaker | eBay
Martin Audio Professional Loudspeaker Series Lineup
S218+ martin speaker dual 18 inch big bass speaker 1200w power subwoofer speaker box, View big bass subwoofer speakers, LASE Product Details from Guangzhou Lase Sound Co., Ltd. on Alibaba.com
BlacklineX Powered Series | Powered Point Source Speakers & Subs