Jensen JMPSW800 Amplified Subwoofer - 8"The JENSEN JMPSW800 Amplified Subwoofer is intended for marine applications and can be mounted horizontally or vertically. Frequency: 60Hz - 200Hz. Ohms: 4. Voice coil: 38.1 mm. 200 Watt.Features of Jensen JMPSW800 Amplified Subwoofer - 8" Water resistant housing with conformal coated circuit boards Vertical ..