Compact Box Subwoofer. Part Number: Ms-55. The Ms-55 Subwoofer Is A Compact, High Efficiency Bass Enclosure Optimized For Marine Applications. Its 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 40 Hertz And Is The Perfect Addition To Any Audio System. Features: Dual Voice Coil, High-Excursion, 5.25'' Inch Woofer. High Density, Uv Stable Enclosure. Water Resistant. Bass-Reflex, High-Efficiency Acoustic Design. Side Vented Output Ports. Compact Size And Molded-In Mounts Provide For Convenient Installation Nearly Anywhere. Acoustically Matched For Use With Polyplanar Me-51, Mz-100 And Me-400 Amplifiers Or Can Be Used With Any Amplifier 25 Watt ?¦( 100 Watt. Specifications: Power Handling: 100 Watt Rms. Speaker Impedance: 4 Ohm X 2 Inputs. Frequency Range: 40 Hertz - 300 Hertz. Weight: 8.5 Pounds (3.8 Grams). Width: 85/8'' Inch (218 Millimeters). Length: 11.5'' Inch (292 Millimeters). Height: 4-13/16'' Inches (122Millimeters). Manufacturer: Polyplanar. Watts = None. Mounting Style = None. Waterproof = None. Main Cone Size (Inches) = None. Cutout Size = None. Qty = None.