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The behaviour of multiple loudspeakers in rooms 15 10 log 10 379 { } W 4 W 1 10 (dB) 5 0 5 10 (a) 100 Frequency (Hz) x = 1 m, y = 1.5 m x = 1.2 m, y = 2.25 m 1000 20 log 10 Loudspeaker A 3m { } P 4 P 1 (dB) 10 Loudspeaker B 0 4m Microphone 10 x Loudspeaker C y Loudspeaker D 10 100 1000