Sound signal output apparatus

An acoustic signal output device, comprising:

• an acoustic signal generator including a speaker driver, and a collar that is a housing accommodating a part of the speaker driver to cause a negative phase sound emitted from the speaker driver in a back surface direction of the speaker driver to travel around in a front surface direction of the speaker driver;
• and
• a direction adjuster attached to the acoustic signal generator to change a front surface direction of the acoustic signal generator output unit,
• wherein:
• the collar includes a first negative phase sound emission hole for emitting the negative phase sound in the front surface direction of the speaker driver,
• the collar accommodates a part of the speaker driver in such a manner that a path from a hole of the speaker driver for emitting the negative phase sound to the first negative phase sound emission hole is short so that the negative phase sound emitted from the first negative phase sound emission hole and a positive phase sound emitted from the speaker driver in the front surface direction of the speaker driver have a substantially anti-phase relationship in a predetermined frequency band in the front surface direction of the speaker driver, and a resonance frequency of an internal space of the collar, the internal space being between the collar and the speaker driver, is high, and
• a user can change an area in which sound leakage is desired to be suppressed by adjusting the direction adjuster.