jbl synthesis scl 10JBL Synthesis SCL 10 Compact in wall speaker for home theater JBL Synthesis SCL 10 is an in wall speaker for home theaters where space is more limited, but expectations for sound are still high. It is well suited as an LCR channel behind a screen or integrated into furniture, giving you a solution that combines a compact format with cohesive and controlled playback. With a compression driver, HDI horn, and dual 6. 5 woofers, you get a speaker that