speaker subwoofer: 1.12inch 2.good sound 3.OEM is ok ... DaDa Auto CO.LTD ,a professional corporation for making car audio more than 10 years, such as speaker.amplifier,capacitor , cable ,woofer ... standards and with professional designers. So, our products are sold well in south America, european market high quality subwoofer speaker /BS1200 subwoofer speaker /car audio ...