JBL Professional JBL LSR310S Powered studio subwoofer

The LSR310S adds low end to a monitor setup: a custom 10-inch high-excursion down-firing driver on a 200 W Class D amplifier, in an 18 mm MDF cabinet with JBL's patented Slip Stream port. Low-frequency extension is 27 Hz and peak output is 113 dB.

Three crossover settings are provided - 80 Hz, XLF and External. The XLF position swaps in the extended low-frequency tuning used in dance clubs, so you can check a mix against that curve without re-rigging anything. Two XLR and two TRS balanced inputs feed it, and two XLR outputs pass on to the monitors.