JBL LSR310S 10" Active Studio SubwooferExtend your system LF all the way down! The LSR310S subwoofer incorporates JBLs patented Slip Stream Port working in concert with a custom 10" down firing driver and a 200 Watt amplifier to add deep, powerful bass to any studio monitor system. A JBL first, the XLF Extended Low Frequency setting lets you hear your tracks with the augmented bass tuning used in todays dance clubs. Features: JBL Patented Slip Stream Port This patented JBL port design