MA475D-PL 500-Watt 4-Channel Marine-Grade Plate Amplifier

The MA475D-PL puts a full four-channel amplifier on a mounting plate, so it installs in a single cutout in a boat panel, a UTV or powersports enclosure, or a speaker box, with only the plate showing. The finned plate is the amplifier's heatsink, and once the plate is sealed into a panel or enclosure, the amplifier is impervious to water.

Run all four channels at 80 W x 4 RMS at 4 ohms or 100 W x 4 RMS at 2 ohms, bridge one channel pair to 170 W for a subwoofer, or bridge both pairs for 170 W x 2. Each channel pair has its own high-pass, flat or low-pass crossover (50 Hz to 500 Hz) with up to 12 dB of bass and treble boost, so you can tune the system without extra processors. RCA and speaker-level inputs connect to almost any head unit, a jack accepts a remote level control, and the protection circuit with thermal shutdown helps keep the amplifier safe.

The plate measures 10.96 x 7.24 in., and the amplifier sits just 1.43 in. deep behind it. A 9.25 x 5.50 in. panel cutout fits the amplifier body; full mounting dimensions are in the product images and the owner's manual.