This replacement subwoofer is designed for Harley-Davidson and Can-Am subwoofer systems.  This model is a "deconstructed" subwoofer equivalent to the M1D2-10B Marine M1 model, but without RGB illumination.  It's designed for high performance bass output in small sealed enclosures and features a 2Ω dual voice coil wired in series to create a 4Ω amplifier load. This item is sold as a single unit (not in pairs). Refer to our COMPATIBILITY chart to verify fitment before purchasing.