B-18 Architect's and Engineer's Specifications
The system shall be of the bandpass subwoofer type consisting of one 18" (457mm) low frequency loudspeaker. 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 ±4dB from 40Hz to 150Hz. Nominal impedance shall be 8 ohms. Power handling shall be 600 watts continuous, 1600 watts program. Sensitivity, measured with 1 watt input at 1 metre distance on axis, mean averaged over stated bandwidth, shall be 102dB. Maximum SPL (peak) measured with music program at stated amplifier power shall be 136dB. Dimensions: 768mmH x 574mmW x 700mmD (30.2"H x 22.6"W x 27.6"D). Weight: 65kgs (143lbs). The loudspeaker system shall be the Turbosound B-18. No other loudspeaker shall be acceptable unless submitted data from an independent test laboratory verify that the above combined performance / size specifications are equalled or exceeded.