Sound system

An acoustic system comprising:

• a reproduction device including an n-th reproduction unit (n=1, . . . , N) that outputs a (2n−1)-th acoustic signal that is an acoustic signal of a predetermined sound source and a 2n-th acoustic signal that is an acoustic signal having an opposite phase to the (2n−1)-th acoustic signal;
• a directivity control device including an n-th directivity control unit (n=1, . . . , N) that generates a (2n−1)-th processed acoustic signal from the (2n−1)-th acoustic signal and generates a 2n-th processed acoustic signal from the 2n-th acoustic signal by executing predetermined signal processing;
• and
• a speaker system including an n-th speaker unit pair (n=1, . . . , N) including a positive speaker unit that emits a sound based on the (2n−1)-th processed acoustic signal and a negative speaker unit that emits a sound based on the 2n-th processed acoustic signal, N being an integer of 1 or more, wherein
• the signal processing executed by the n-th directivity control unit (n=1, . . . , N) is processing of causing a sound emitted from the positive speaker unit of the n-th speaker unit pair and a sound emitted from the negative speaker unit of the n-th speaker unit pair to be audible in an area to be made audible near the n-th speaker unit pair and to be inaudible in an area to be made inaudible,
• the positive speaker unit and the negative speaker unit of the n-th speaker unit pair are arranged such that a sound emitted from the positive speaker unit in a direction opposite to an n-th user direction in which the n-th speaker unit pair faces a user and a sound emitted from the negative speaker unit in a direction opposite to the n-th user direction are transmitted in the n-th user direction by wraparound,
• the n-th speaker unit pair is configured as the positive speaker unit and the negative speaker unit side by side, and
• the positive speaker unit of the n-th speaker unit emits the sound based on the (2n−1)-th processed acoustic signal toward the n-th user direction and the negative speaker unit emits the sound based on the 2n-th processed acoustic signal toward the n-th user direction, and
• the area to be made audible is an area where phases of sounds emitted from the n-th speaker unit pair in the n-th user direction and sounds emitted from the n-th speaker unit pair in the direction opposite to the n-th user direction and going around in the n-th user direction do not match.