Architecture & Engineering SpecificationsThe loudspeaker shall be of the passive subwoofer type consisting of one 18" (457 mm) LF driver. Performance specifications of a typical production unit shall meet or exceed the following: frequency response, measured with swept sine wave input, shall be flat within ±3 dB from 35 Hz to 125 Hz and within -10 dB from 25 Hz to 170 Hz. Nominal dispersion, shall be Half Space. Nominal impedance shall be 8 Ohms. Power handling shall be 1000 Watts continuous, 4000 Watts peak. Sensitivity, measured on axis, mean averaged over stated bandwidth, shall be 97 dB, 1 Watt @ 1 metre. Maximum SPL (peak), measured at 1 metre with music program at stated amplifier input, shall be 133 dB. Dimensions: 660 mm high x 560 mm wide x 660 mm deep (26.0" x 22.0" x 26.0"). Net weight: 38.6 kg (85.0 lbs). The loudspeaker system shall be the TURBOSOUND TCX118B. No other loudspeaker shall be acceptable unless submitted data from an independent test laboratory verifies that the above combined performance / size specifications are equalled or exceeded.