JL Audio MMP-1-BK Mounting Adaptor Plate for MediaMaster. Mounting Adaptor Plate for JL Audio® MM100s Source Unit. The MMP-1-BK mounting adaptor plate allows you to install a MediaMaster® MM100s into existing source unit openings that are larger than needed for the MM100s (up to 8.17 x 3-inch / 208 x 80 mm). Constructed from a single piece of marine-grade, machined aluminum, the MMP-1-BK provides a solid surface to mount your MediaMaster. MM100s in locations previously occupied by other marine manufacturers’ source units.
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