Compact Box SubwooferPart Number: MS-55 The MS-55 subwoofer is a compact, high efficiency bass enclosure optimized for marine applications. It's small size enables it to be easily mounted below seats, under the gunwale area, behind the instrument panel, or any convenient location. The MS-55 is a self contained bass unit requiring no cutting of panels or holes in the boat interior. It produces solid, deep bass extending down to 40Hz and is the perfect addition to any audio system.FeaturesDual Voicecoil, high-excursion, 5.25" wooferHigh density, UV stable enclosureWater resistantBass-reflex, high-efficiency acoustic designSide vented output portsCompact size and molded-in mounts provide for convenient installation nearly anywhereAcoustically matched for use with PolyPlanar ME-51, MZ-100 and ME-400 amplifiers or can be used with any amplifier 25W - 100WSpecificationsPower Handling: 100W RMSSpeaker Impedance: 4 ohm x 2 inputsFrequency Range: 40 Hz - 300 HzWeight: 8.5 lb (3.8g)Width: 8-⅝" (218mm)Length: 11-½" (292mm)Height: 4-13⁄16" (122mm)