Pioneer GM-ME500X1 is a 1600-watt Class-D mono amplifier specifically designed for use in marine environments. It is a durable and weather-resistant amplifier suitable for a boat or other vehicles exposed to the elements. 
Product features
Marine-grade construction: The circuit boards are conformal coated to prevent corrosion, and the side panels and RCA terminals are protected by rubber covers to keep out water and dirt. The white finish and top plate are also designed to withstand the marine environment.
Protection control system: An integrated "protection control system" detects the amplifier's internal temperature and moderates the input level to prevent circuit shutdown.
1-Ohm stable circuitry: The amp is designed with stable, durable circuitry that reduces the risk of high input power and allows for a 1-ohm connection. This offers the flexibility to connect multiple subwoofers.
Automatic signal sensing: The "automatic signal sensing and turn-on" feature automatically detects an input signal and turns the amplifier on and off, simplifying installation when connected via the speaker line input.
Wired bass boost remote: The amplifier comes with a wired remote control for adjusting the bass boost, allowing for easy tuning of your audio.
Variable low-pass filter: The low-pass filter can be adjusted between 40 and 240 Hz to customize the audio frequency and match the characteristics of your subwoofer(s). 
Amplifier class: Class-D
RMS power output:
 
800 W x 1 (1Ω)
Frequency response: 10 Hz – 50 Hz
Impedance: 1Ω to 8Ω
Dimensions: 252 mm x 60 mm x 215 mm