Passive under-seat subwoofers for cars are compact bass speakers designed for those who want to enhance the music experience without sacrificing trunk or cabin space. Due to their small construction they install easily directly under the front seat, where they remain unobtrusive yet can significantly enliven the lower frequencies. Because they are passive, they require connection to an external amplifier, which allows greater tuning options and better integration with the rest of the sound system. Another advantage is the wider choice of models by power and bass character. A passive under-seat subwoofer is an ideal option for drivers who want a compact, space-saving solution with the possibility of individual adjustment and a stronger bass foundation than door speakers alone can provide.