Journal of the Society of Motion Picture Engineers (1930-1949)

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June, 1941] ACOUSTIC DESIGN FEATURES 615 TABLE V Studio Review Rooms Review Size Room (Cu-Ft) Theater Optimum Reverberation Time (Cps) (Sec) Measured Reverberation Time (Empty) Reverberation Time in Per Cent Below Optimum Room 1 26,000 250 1.02 0.53 (Fig. 17) 500 0.94 0.60 1000 0.91 0.58 2000 Av. 0.91 0.52 40.4 0.94 0.56 Room 2 4,300 250 0.66 0.70 (Fig. 18) 500 0.63 0.50 1000 0.62 0.37 2000 Av. 0.62 0.33 23.8 0.63 0.48 Room 3 25,500 250 1.02 0.92 (Fig. 15) 500 0.94 0.90 1000 0.91 0.88 2000 Av. 0.91 0.85 5.3 0.94 0.89 Room 4 33,500 250 1.05 0.89 (Fig. 19) 500 0.97 0.80 1000 0.94 0.82 2000 Av. 0.94 0.77 15.4 0.97 0.82 Room 5 22,500 250 1.00 0.68 (Fig. 20) 500 0.93 0.54 1000 0.90 0.34 2000 0.90 0.34 Av. 0.93 0.48 48.4 Room 6 22,000 250 0.99 0.62 (Fig. 21) 500 0.92 0.67 1000 0.89 0.62 2000 0.89 0.56 Av. 0.92 0.62 32.6 Room 7 26,000 250 1.02 0.66 (Fig. 22) 500 0.94 0.61 1000 0.91 0.54 2000 0.91 0.57 Comments Dead Good Good Av. 0.94 0.60 36.2