Harman Kardon FLOW 300S  is a 3-inch (89mm) midrange car audio speaker designed to provide detailed, natural sound reproduction as part of a premium component system. 
 
Sound Quality: Reviewers praise the speakers for delivering "rich mids" and a detailed audio experience. The DCC cones are specifically mentioned for contributing to clear, natural sound reproduction.
Design: The aesthetic appeal, including the iconic 60-degree slash grille pattern and turbine-shaped venting for cooling, has been well received.