JBL Professional Studio Subwoofer, 15.00 x 15.65 x 17.65 inches (LSR310S) JBL Patented Slip Stream Port This patented JBL port design works in concert with the LSR310S low frequency driver for deep, dynamic bass response at all playback levels. XLF Extended Low Frequency Setting JBL first, the XLF setting activates a specially-engineered tuning that emulates the ample bass tuning used in today's dance clubs. The custom-designed driver in the LSR310S delivers deep low frequency response into the 20 Hz region, and 113 dB peak output, for long periods at full rated power with no risk of failure. Professional Balanced Inputs and Outputs with balanced XLR and 1/4-Inch inputs and XLR outputs you can add the LSR310S to any studio monitor system to extend its low frequency performance. Selectable Input Sensitivity The -10dBV/+4 dBu sensitivity switch ensures compatibility with a broad range of signal sources, allowing you to connect the LSR310S to high-output professional equipment without any danger of input overload..Maximum Peak Input Level:+20.3 dBu Purchase includes: studio monitor, power cable, and set-up guide Inputs: balanced XLR (x2) and TRS (x2) AC input voltage: 100  240VAC (10%), 50 / 60Hz Pair with the JBL 305P MkII, 306P MkII, or 308P MkII studio monitors for stunning audio detail and an impressive dynamic range!