ILA WL118-sw The line array subwoofer shall incorporate an 18-inch cone transducer with a 4-inch voice coil. The low frequency driver shall be loaded into a direct radiating vented enclosure. The line array subwoofer shall meet the following performance criteria: frequency response of 29 Hz to 800 Hz ±10 dB, measured on axis; sensitivity of 98 dB SPL in free field at 1 meter with an input of 2.83V; continuous output of 128.5 dB SPL; peak output of 134.5 dB SPL; power handling of 850 watts for two hours with IEC-specified noise; recommended amplifier power of 1750 watts; nominal impedance of 8 ohms. The loudspeaker shall have a rectangular enclosure constructed of 18 mm Baltic birch plywood. It shall have a black or white paintable finish. Input connectors shall be parallel wired Neutrik NL8 Speakon connectors. The enclosure shall have 4 handles and an integral rigging system compatible with the ILA WL2082-I line array. The front of the line array subwoofer shall be protected by a perforated grille. The line array subwoofer's enclosure shall be 22.1 in (56.1 cm) high, 27.0 in (68.6 cm) wide and 30.25 in (76.8 cm) deep. The loudspeaker shall weigh no more than 111 lb (50.4 kg). The line array subwoofer shall be the QSC Audio Products WL118-sw.