Here is a little more info....
RC-LINK AMPLIFIER FAMILY FEATURES:
REGULATED CLASS-D DESIGN, MAXIMUM EFFICIENCY, MINIMAL HEAT
HIGH FIDELITY OUTPUT WITHOUT TAXING THE CHARGING SYSTEM
2 OHM STABLE FOR DRIVING MULTIPLE SPEAKERS OR SUBWOOFERS
STANDARD CONNECTION INTERFACES FOR UNIVERSAL APPLICATIONS
BUILT-IN CROSSOVERS FOR COMPLETE SYSTEM CUSTOMIZATION
2OZ COPPER CLAD GOLD PLATED MULTI-LAYER CIRCUIT BOARD
CONFORMAL COATED FOR CORROSION AND WATER PROTECTION