The JVC KS-DR2104DBT is a compact 4-channel Class-D amplifier engineered for marine, motorcycle, UTV, ATV, and powersports audio systems. Featuring built-in Bluetooth streaming capability, waterproof construction, and impressive power output in an ultra-compact chassis, this amplifier delivers clean, powerful sound without requiring a traditional head unit. Designed for harsh outdoor environments, the KS-DR2104DBT features IP66/IP67 waterproof and dustproof protection, ASTM B117 salt-spray resistance, and vibration-resistant construction. The included waterproof Bluetooth controller allows direct music streaming from your smartphone while keeping installation simple and clean. Features Compact 4-channel Class-D amplifier Built-in Bluetooth 5.0 audio streaming Waterproof Bluetooth remote controller included Marine & powersports rated construction IP66 / IP67 waterproof & dustproof protection ASTM B117 rustproof certification Vibration-resistant design Compact chassis for tight installations Variable high-pass & low-pass crossovers Bridgeable channel operation Smartphone direct audio streaming Ideal for motorcycles, boats, UTVs & ATVs Specifications Amplifier Type: 4-Channel Class-D RMS Power Output: 50W x 4 @ 4 Ohms 75W x 4 @ 2 Ohms 150W x 2 Bridged @ 4 Ohms Peak Power: 600 Watts Frequency Response: 10Hz – 20kHz Signal-to-Noise Ratio: 89dB Bluetooth Version: Bluetooth 5.0 Waterproof Rating: IP66 / IP67 Crossovers: Variable HPF: 50Hz – 200Hz Variable LPF: 50Hz – 200Hz Dimensions: 7-13/16” W 1-15/16” H 4-1/8” D Weight: 3.5 lbs Included In The Box KS-DR2104DBT amplifier Waterproof Bluetooth controller Wiring harness Inline fuse holder Mounting hardware Owner’s manual