Fusion MS-AM402 2 Channel Marine Amplifier. The amplifier is a 400 Watt 2-Ohm stable (per channel) design which ensures clean and powerful amplification. There is a pass through RCA output which enables linking of multiple amplifiers for enhanced system performance. The Conformal Coated Circuitry provides protection from salt air and moisture and Heat Sink technology transfers heat more efficiently. It is capable of powering 2 speakers, a sub (bridged) or 4 speakers in parallel. Signal-to-Noise Ratio: 95 dB. Variable Bass Boost: 0 – + 18dB. 2 Ohm Stable MOSFET Amplifier Design. 4 Gauge Power and Ground Connections. Nickel Plated Audio Input and Output RCA Connections. Nickel Plated RCA Output for Multi-Amp Installations. Please allow us the opportunity to resolve any issues before opening disputes and/or leaving feedback. If the item includes an ac power adapter for use, it will be 120 volts. Please ensure that this product is compatible with the standards within your country before purchasing.