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Fusion Innovation

Ground breaking technologies by FUSION Marine

Class-D Marine Amplifier Technology

Understanding the way our customers use electronics on-board their vessels challenged the FUSION engineering team to produce a solution that not only increased the amplifier output of the stereo to combat engine noise, but also drew less current to ensure the tunes lasted for the duration of your excursion.

The solution: Class-D. Not only will a Class-D amplifier draw less current, it is the most efficient choice for a marine stereo because it has little to no heat transfer and provides more power than a conventional Class-AB amplifier.


What Is Class-D Technology?

Class-D amplifiers use a different process of circuitry compared to class A, B and AB. Class-D amplifiers operate output transistors as switches, rendering them ON or OFF during the power stage, resulting in low power dissipation compared to the other classes of amplifiers that are operated in a linear mode.

This increases the efficiency of the amplifier, therefore reducing draw from the power supply and requiring a smaller heat sink in the amplifier. Class-D amplifiers can reach efficiencies of 90%, having the potential to extended the battery life of battery powered audio equipment by 2.5 times or more.


The audio signal is filtered by a passive low-filter that removes all the unwanted high-pitched frequencies that cannot be heard, storing the excess energy until it is required instead of transferring it into heat. The low-frequencies portion of the spectrum is then separated and used as the output signal for the speaker, resulting in a pure sound.

With improved efficiency, lower operating temperatures, and lower power consumption translating into lower system costs, Class-D amplifiers are the solution for battery powered audio entertainment systems.

FUSION was the first to introduce this technology to marine entertainment, and continues to pioneer efficient technologies for the marine environment.