jbl synthesis scl 9JBL Synthesis SCL 9 On wall speaker for home theater with flexible placement and discreet design JBL Synthesis SCL 9 is an on wall speaker for home theaters where in wall installation is not an option, but you still want a solution that fits sonically. It works both as an LCR and surround speaker, making it easy to build a cohesive system directly on the wall. With a compression driver, HDI horn, and dual 5. 25 woofers, you get a speaker that delivers