Sony XM604M Marine 4/3-Channel Amplifier (Discontinued by Manufacturer) Marine amplifier delivers 110 W x 4 (at 4 ohms), 150 W x 2 (at 2 ohms), 300 W x 1 (BTL, at 4 ohms) Conformal circuit board coating, UV-resistant and anti-rust paint, gold-plated connections/hardware Accepts RCA line inputs and high-level speaker output connections, with adjustable input level Low and high-pass filters with 18 dB/octave (low-pass) and 12dB/octave (high-pass) slope at 80Hz Built-in protection circuitry for thermal overload, direct current, and short circuiting