... Phase Control Continuously Variable Control for Crossover Frequ Home audio speaker, subwoofer,woofer,usb speaeker, Multimedia speaker ,Computer Speaker,Mini ... Type of Input Connections ( Speaker-in, Line-in, Subwoofer-in)With superior Load Characteristics, Deep Bass is Guaranteed Multiple ... mode.Feed Forward Anti-Distortion TechnologyTurn any speaker or subwoofer too loud and it'll distort. Instead of ...