Acoustic devices

An acoustic device, comprising:

• a diaphragm;
• a housing configured to accommodate the diaphragm and form a first acoustic cavity and a second acoustic cavity respectively corresponding to a front side and a rear side of the diaphragm, wherein the diaphragm radiates sounds to the first acoustic cavity and the second acoustic cavity, respectively, the sounds are guided through a first acoustic hole coupled with the first acoustic cavity and a second acoustic hole coupled with the second acoustic cavity, respectively, and the first acoustic hole and the second acoustic hole form dipole sound sources;
• and
• a sound absorption structure, wherein the sound absorption structure is coupled with the second acoustic cavity and is configured to absorb the sound transmitted to the second acoustic hole through the second acoustic cavity in a target frequency range, and in the target frequency range, a sound pressure level at the second acoustic hole when the sound absorption structure is not disposed is greater than a sound pressure level at the second acoustic hole when the sound absorption structure is disposed.