Roswell's RMA 600.4 Amplifier is a bridgeable 4-channel Class D style that features an extremely flexible crossover network. This design allows full range, high-pass, low-pass, and elaborate band-pass applications. Complete marine grading highlights the quality of materials used, including conformal-coated PCB boards and gold-plated RCA and wire terminals. The RMA 600.4 is powerful for its compact size and is primed to deliver unmatched sound power and quality across your entire boat. Power ratings: 90W x 4 at 4 ohms; 150W x 4 at 2 ohms. 10Hz - 50Hz frequency response. Signal to noise ratio: greater than 104dB. Measures 9-1/8" x 7" x 2".