DAVIE, FLA., March 8, 2018 (MEDIAWIRE) – SounDigital USA, producer of award-winning, competition-grade amplifiers for the vehicle, introduced three new marine amplifiers at the KnowledgeFest trade show in Long Beach, Calif. The marine line is the company's first foray into amplifiers designed specifically for boats and recreational vehicles. All amplifiers feature a bridgeable four-channel, Class DAVIE, FLA., March 8, 2018 (MEDIAWIRE) – SounDigital USA, producer of award-winning, competition-grade amplifiers for the vehicle, introduced three new marine amplifiers at the KnowledgeFest trade show in Long Beach, Calif. The marine line is the company's first foray into amplifiers designed specifically for boats and recreational vehicles. All amplifiers feature a bridgeable four-channel, Class