Main St. Stereo 5520 Sunrise Hwy, Sayville, NY11782 Main St. Stereo has been around since 1974. The store was the first car stereo shop in Suffolk County. Its friendly and…More knowledgeable staff is what keeps people coming back and referring others to do the same. Main St. Stereo specializes in the installation of car and marine electronics, as well as home theater systems.