This package includes (2) JBL PRX815W and (2) PRX818XLFW Powered Speakers. The JBL PRX815W is a full-range speaker designed for main system and floor monitor applications. Featuring a 15-inch, 2-way, bass-reflex design powered by a 1500-watt class-D amplifier, PRX815W delivers incredible volume in a lightweight and compact form factor. The JBL PRX818XLFW is a self-powered extended low-frequency subwoofer system. Featuring a JBL 18-inch woofer powered by a 1500-watt class-D amplifier, PRX818XLFW delivers incredible output but still keeps a lightweight and compact form.JBL Pro