Get the JBL LSR310S subwoofer right here: https://www.sweetwater.com/store/detail/LSR310S
Designed as a companion to JBL’s LSR active studio monitor series, the LSR310S powered subwoofer takes the low-end load off of your nearfields. A 10″ down-firing driver delivers tight and focused ball, so you get truly balanced 3-way sound. Onboard the LSR310S, you’ll find a selectable crossover that sports JBL’s XLF Extended Low Frequency Setting, giving you plenty of flexibility to get the low-end contour you need.
