A digital sound processor (DSP) is a device that is used to enhance and optimize the audio performance of a boat's sound system. It is designed to process and manipulate audio signals in order to improve the sound quality and clarity of the music being played.

A DSP can be used in a number of ways to improve the sound of a boat's audio system. For example, it can be used to:

Equalize the audio signals: The DSP can adjust the balance of different frequency ranges within the audio signal to optimize the sound for the particular environment and speakers of the boat.

Correct for distortion: The DSP can correct for distortion and other audio problems caused by the acoustics of the boat or by the limitations of the speakers.

Enhance the overall sound quality: The DSP can improve the overall sound quality of the audio system by smoothing out the frequency response and reducing noise.

To use a DSP, it is typically connected to the audio source (such as a radio or CD player) and the amplifier, and it is controlled using a separate processor or through a smartphone app. Some DSPs are integrated into the amplifier or other audio components, while others are standalone units.