1.

The capacity of a hall is 600 persons and its volume is 3000 cu.m. If an optimum reverberation time of 1.0 second is to be achieved then the required total absorption (m sabine) is _______

A. 375 to 385
B. 575 to 485
C. 475 to 485
D. 475 to 685
Answer» D. 475 to 685


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