These drivers are mounted to QSCs patented multiple-aperture diffraction waveguide that provides an extremely wide horizontal coverage of 140 degrees. As a result, systems will rarely require side or center fill speakers and solid stereo imaging is preserved across the listening area. The low-frequency capability of a WL2082-i array extends to 68 Hz (-10 dB); adequate for speech/vocal and acoustic music program material. For reinforcement of program material with more demanding low-frequency content, the WL118-sw companion subwoofer is available.