Powerful 1200-watt 4 channel amplifier (150-watt RMS per channel) designed to power up to four pairs of speakers or two pairs of speakers and one subwoofer Easy Tune feature automatically adjusts audio settings for the best possible sound quality (requires setup using the Fusion-Link app on a compatible smartphone) Class-D amplifier design uses less power for longer listening with reduced battery drainage Includes mounting bracket for simple installation Important Note: Amplifier is designed exclusively for use with Fusion DSP-enabled stereos (Apollo RA770, Apollo RA670, Apollo WB670 and RA210) and Fusion speakers