As described above, the acoustic device 10E illustrated in FIG. 6 uses the two speakers arranged back-to-back to reproduce each of the left ear signal and the right ear signal with bidirectional directivity and to reduce crosstalk components. In addition, in this case, the two speakers arranged at a short distance are used for the middle and high frequency component. This makes it possible to easily give bidirectional directivity. In addition, in this case, two speakers arranged at a long distance are used for the low frequency component. Therefore, the propagation direction of the crosstalk component becomes closer to the direction of a null regarding the bidirectional directivity, and this makes it possible to drastically reduce the crosstalk component. In addition, many loudspeakers such as a speaker array are not necessary for the acoustic device 10E, the acoustic device 10E is not subject to restriction of position with regard to arrangement of speakers unlike in the case of using the speaker array, and it is possible to favorably reduce crosstalk components and achieve favorable stereophonic reproduction (virtual surround).
Sixth Embodiment
