Installed in a bass reflex tube, this active sub-woofers is powerful enough to create the low frequencies that can^t be produced from an OEM solution. With a newly designed woofer, this sub-woofers is now even more powerful. Easy bass reinforcement Amplifiers are being assembled in small sizes. High sound quality operational amplifier NJM is set for analog circuit. Therefore, this models is able to reproduce a high quality bass sound with built-in amplifier. Sound quality adjustment The gain controller function enables to reach the favorite sound taste & quality easily. Amazing bass volume With the adoption of the high power class D amplifier, you can feel an amazing volume of bass sound. Flexible Installation You can connect this tube subwoofer with various type of car stereos using speaker line connection or using RCA connection. Seal of genuinity Years of research & state-of-art production facilities is our secret behind every Pioneer speaker^s quality sound reproduction. Our popularity with you have attracted cheap speakers being sold under Pioneer brand name. Use our 3-D hologram on the speaker package to identify a genuine product and safe-guard yourself from cheap fake products.