Architecture & Engineering Specifications The speaker shall be of the full range, two-way switchable bi-amp/passive type consisting of one 12" (316 mm) LF driver and one 1.4" (36 mm) HF compression 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 43 Hz to 18 kHz and within -10 dB from 37 Hz to 20 kHz. Nominal dispersion, at -6 dB points, shall average 60° H x 40° V. Nominal impedance shall be HF: 6 Ohms, LF: 8 Ohms; passive: 8 Ohms. Power handling shall be HF: 75 Watts continuous, 300 Watts peak, LF: 600 Watts continuous, 2,400 Watts peak; passive: 600 Watts continuous, 2,400 Watts peak. Sensitivity, measured on axis, mean averaged over stated bandwidth, shall be 96 dB, 1 Watt @ 1 metre. Maximum SPL (peak) measured at 1 metre with music program at stated amplifier input shall be HF: 134 dB, LF: 130 dB; passive: 130 dB. Dimensions: 711 mm high x 368 mm wide x 458 mm deep (28.0" x 14.5" x 18.0"). Net weight: 23.4 kg (51.1 lbs). The loudspeaker system shall be the TURBOSOUND TPZ122/64. No other loudspeaker shall be acceptable unless submitted data from an independent test laboratory verifies that the above combined performance / size specifications are equaled or exceeded.