The Sunfire Subwoofer legacy lives on in the SpeakerCraft SDSi Subwoofer Series. Based on decades of bass innovation and patents these subwoofers move sound innovation and technology forward. The SDSi Series 15″ is powerful and compact, made to rock today’s world in a whole new way. With premium performance and no-compromise on sound quality, hear and feel an immersive listening experience. From the moment these are installed, you’ll understand exactly why not all subwoofers are created equal.