Acoustic signal output device

An acoustic signal output device comprising:

• a first driver unit that emits a first acoustic signal to one side and emits a second acoustic signal to another side;
• a second driver unit that emits a fourth acoustic signal to one side and emits a third acoustic signal to another side;
• a first housing portion in which a wall portion is provided with a single or plurality of first sound holes for leading out the first acoustic signal emitted from the first driver unit to an outside and a single or plurality of second sound holes for leading out the second acoustic signal emitted from the first driver unit to an outside;
• and
• a second housing portion in which a wall portion is provided with a single or plurality of third sound holes for leading out the third acoustic signal emitted from the second driver unit to an outside and a single or plurality of fourth sound holes for leading out the fourth acoustic signal emitted from the second driver unit to an outside,
• wherein a frequency bandwidth of the third acoustic signal and the fourth acoustic signal emitted from the second driver unit is narrower than a frequency bandwidth of the first acoustic signal and the second acoustic signal emitted from the first driver unit,
• in a case where the first acoustic signal is emitted from the first sound holes, the second acoustic signal is emitted from the second sound holes, the third acoustic signal is emitted from the third sound holes, and the fourth acoustic signal is emitted from the fourth sound holes, an attenuation rate of the first acoustic signal at a second point with reference to a predetermined first point, where the first acoustic signal arrives at the first point and the second point is farther from the acoustic signal output device than the first point, is designed to be
• equal to or less than a predetermined value smaller than an attenuation rate due to air propagation of an acoustic signal at the second point with reference to the first point, or
• an attenuation amount of the first acoustic signal at the second point with reference to the first point is designed to be
• equal to or more than a predetermined value larger than an attenuation amount due to air propagation of an acoustic signal at the second point with reference to the first point.