NavAtlas Bma475 4-Channel Amplifier The NavAtlas 4-channel amplifier is designed to be both waterproof and resistant to vibrations, ensuring durability in various conditions. Features: Class D amplifier with Mosfet power supply RCA inputs Variable gain control Built-in crossover (35Hz - 250Hz) Bridge mode Stable 2-ohm stereo Specifications: RMS power output: 75W x 4 channels 4 Ohms 98W x 4 channels 2 Ohms 140W x 2 channels 4 Ohms (bridged) Peak power: 300W Snr: 80dB Frequency Response: 10Hz-35kHz Dimensions: 1.5 x 9 x 3