JBL Direct-Radiating In-Ceiling Subwoofer JBL-CONTROL 40CS/T High-Impact In-Ceiling Subwoofer The Control 40CS/T is a direct radiating, high impact, 8 subwoofer with a built-in passive crossover network enabling the Control 40CS/T to be used as part of a subwoofer-satellite system. When combined with the Control 42, the Control 40CS/T offers an extremely natural sounding and powerful subwoofe