Fusion® Apollo™ marine amplifiers are the difference between hearing the music and feeling it. These amplifiers are efficient, easy-to-install and designed exclusively for use with compatible Fusion DSP-enabled stereos (Apollo RA770, Apollo RA670, Apollo WB670 and RA210) and Fusion speakers. The zone amplifier is designed to provide audio zone expansion for high-quality sound in more zones on board your boat and features the Easy Tune feature to automatically regulate audio settings for the best sound quality without manual adjustments (requires setup using the Fusion-Link™ app on a compatible smartphone). True-Marine™ designed, the Apollo amplifiers come with a 3 year limited consumer warranty.