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Pioneer TS-A300B 12" 1500W "A" Series Pre-Loaded Ported Enclosure glue What is the difference betweenDesigned to Perfectly Match the Pioneer A Series Full Range Loudspeakers The bass reflex port is uniquely shaped to reduce port noise while producing clear and accurate bass. Combining the latest design and technology with specifically selected materials this subwoofer enclosure provides high quality sound and excellent bass response. Match with a compatible Pioneer amplifier for an impressive in car experience! IMPP Cone Construction 12 glass fiber