Extend your system LF all the way down! The LSR310S subwoofer incorporates JBL’s 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 today’s dance clubs. With 10-inch High-Excursion, Down-Firing driver brings you low Frequency Extension down to 27 Hz. Max Peak SPL 113 dB. Crossover Settings: 80 Hz, XLF or External. Dimensions (HxWxD)    448 mm x 381 mm x 398 mm (17.65 in x 15 in x 15.65 in). Weight 15.6 kg / 34.3 lbs