Since the direction of sound is not perceived at very low frequencies, it is feasible to use only one subwoofer for low frequency reproduction in commercial multi-channel audio setups. A listening test was conducted to find the crossover frequency where the listeners begin to detect the subwoofer presence. The test was arranged in a symmetrical listening room using four pairs of Genelec 1037C speakers, arranged symmetrically in four angles to the front of the listener to equalize the timbres as well as possible in reverberant conditions. The detection judgement was done using a version of the two alternatives forced choice (TAFC) adaptive method, with which the 75 % point of the psychometric function was found.
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