Subwoofers View All Full Range Speakers View All Amplifiers View All Technology SpotlightBassTrac® This proprietary circuit tracks and controls low frequencies to keep the bass clean, tight, and distortion-free at all listening levels.Authorized RetailersBoston Acoustics audio products are sold worldwide only by authorized dealers. Our carefully selected dealers are fully trained to demonstrate and service all of our products. In addition, Boston Acoustics provides a manufacturers warranty to all Boston products sold by authorized dealers.view