engineering drawingfrequency

TCS-215C Architects' and Engineers' Specifications
The loudspeaker shall be of the front-loaded low frequency type, consisting of two reflex loaded 15" (381mm) low frequency loudspeakers. Performance specifications of a typical production unit shall be: Frequency response, measured with swept sine wave input, shall be flat within ±4dB from 40Hz to 150Hz. Nominal impedance shall be 4 ohms. Power handling shall be 600 watts r.m.s., 1200 watts program. Sensitivity, measured with 1 watt input at 1 metre distance on axis, mean averaged over stated bandwidth, shall be 99dB. Maximum SPL (peak) measured with music program at stated amplifier power shall be 133dB. Dimensions: 891mm x 550mm x 506mm (35.1" x 21.7" x 19.9"). Weight: 47kgs (103.4lbs). The loudspeaker shall be the Turbosound TCS-215C. 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.