KTP-445A - Alpine 4-Channel 45W RMS X 4 Amplifier at 4-ohms * Plug-and-play compact Class D amplifier for Alpine in-dash receivers * 45 watts RMS x 4 at 4 ohms (CEA-2006 compliant) * Selectable gain switch (high/low) * 2-9/16"W x 1-1/2"H x 7-13/16"D