HERTZ HCP 2MXHERTZ (HCP 2MX) CLASS AB 2 OHMS 2 CHANNEL MARINE STEREO AMPLIFIER HCP 2 MX marine amplifier feature a compact design ready to face the open water environment, providing tons of clean power. The HCP M heat sink has been crafted from extruded aluminium, a material unmatched for lightness, robustness and heat dissipation. To keep size to a minimum, the power transistors are placed between the PCB and the top side of the heat sink where heat is gathered.