Physical Dimensions Without Bracket: 9.25" x 7.06" x 1.75" (235 x 180 x 45mm) Weight: 4.85 lb (2.2kg) Water Rating: IPX2 Amplifier Class: Class-D CEA-2006 Power Rating: 650-watt RMS x 1 @ 14.4 V input - 4 ohm Installation iOS App Android App Amplify the moment with an Apollo? marine amplifier ? designed specifically for use with any Fusion DSP-enabled marine stereo and Fusion speakers. This powerful and efficient monoblock amplifier is the difference between hearing the music and feeling it. With an impressive 650-watt RMS (at 4 ohm) this amplifier is specifically designed to power a subwoofer. The Easy Tune feature automatically regulates audio settings for the best sound quality without manual adjustments (Requires setup using the Fusion-Link? app on a compatible smartphone). Features: Impressive Power:650-watt RMS (at 4 ohm) specifically designed to power a subwoofer. Efficient Class-D Design: Uses less power listen to music for longer at higher volumes with less drain on the battery. Easy Tune Feature:Automatically adjusts audio settings for the best possible sound quality with no manual adjustments required (Requires setup using the Fusion-Link app on a compatible smartphone). LED Indicator:Show issues with electrical currents and shorts as well as temperature. Less Total Harmonic Distortion:The amplifier is designed with minimal distortion and noise allowing for better quality audio. Ignition Protected:Intelligent electronic fuse prevents damage from over/under current temperature output short and other faults. Conformal Coated PCBs:The amplifier circuit board has been specially coated to provide enhanced protection from the marine elements. Powder Coated Aluminum Finish: Salt fog temperature vibration and UV tested with a modern aesthetic stylish design. Easy Installation: Proprietary cable connectors and a mounting bracket is included in the box. The cable connectors allows the installer to pre-wire the speakers/subwoofers while the mounting bracket simply clips the amplifier in place for a clean finish.