The Pioneer A-Series 10 in. 1 300-Watt Dual Voice-Coil Subwoofer is designed to purposely match A-Series loudspeakers to provide seamless and smooth sound characteristics with dynamic high impact bass that lets you hear and feel the music. Linear balanced motion in both the forward and reverse directions of cone movement is critical to accurate reproduction of recorded sound waves. Careful engineering of the entire motor structure and suspension system (voice coil magnet surround and spider) of this A-Series subwoofer is required maintain a high level of linearity even during high output/high excursion transients. For sound that counts choose a Pioneer subwoofer.