Garmin Fusion AM Series Marine Amplifier Marine Electronic Accessory - Purpose-built for the marine environment, the AM Series marine amplifiers are designed to enhance your on-water listening experience with quality audio amplification. Class-AB amplifier design delivers efficiency with reduced distortion. Connect up to two speakers per channel at 2 ohms, or bridge two channels at 4 ohms for increased power. Conformal coated PCBs provide extra protection from the marine elements. Heat sink provides greater dissipation of heat for enhanced component reliability. The amplifiers are available in 2-channel and 4-channel configurations.