engineering drawingfrequency

TQ-425SP Architect's and Engineer's Specifications
The system shall be of the self-powered type consisting of two 15" (381mm) low frequency loudspeakers in a vented enclosure. 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 45Hz to 200Hz. Maximum SPL (peak) measured with music program at stated amplifier power shall be 138dB. Dimensions: 836mmH x 511mmW x 632mmD (32.9"H x 20.1"W x 24.9"D). The loudspeaker system shall be the Turbosound TQ-425SP. 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.