This is the Brand New MA Audio Compact Subwoofer with Built-in Class A/B Amplifier and is designed to be installed in various small, tight spaces, with the ability to fit under seats, behind seats or inside small storage compartments this product is extremely versatile. Don’t let the size fool you as this product is capable of producing great bass from a tiny space. 6×9 inch Low profile Amplified Car Subwoofer. 6″x9″ woofer with Built-in Amplifier. Variable Low Pass Filter, Subsonic Filter and Bass Boost. Mesh Protection Grille for woofer. Remote Subwoofer Level Control. Thermal, Overload and Short Protection Circuits. High Level and RCA Low Level Inputs, Switchable Phase Control. Green & Red LED power status indicator. 29 x 21.5 x 6.5 cm.