JBL 306P MkII - Studio Monitor Kit with Powered Subwoofer,
JBL LSR310S 10-inch Powered Studio Subwoofer | Sweetwater
Used - Very Good: JBL Cinema 610 5.1 CH Home Theater Speakers System with Powered Subwoofer and Dedicated Center Speaker Home Audio Speakers - Newegg.com
JBL EON718S 1500-watt 18-inch Powered PA Subwoofer | Sweetwater