Acoustic output device and components thereof

An acoustic output device, comprising:

• an earphone core including at least one low-frequency acoustic driver and at least one high-frequency acoustic driver, the at least one low-frequency acoustic driver configured to output sounds from at least two first guiding holes, the at least one high-frequency acoustic driver configured to output sounds from at least one second guiding hole, wherein the at least one second guiding hole includes at least two second guiding holes, a first distance is between the two first guiding holes, a second distance is between the two second guiding holes, and the first distance exceeds the second distance;
• a controller configured to direct the at least one low-frequency acoustic driver to output the sounds in a first frequency range and direct the at least one high-frequency acoustic driver to output the sounds in a second frequency range, the second frequency range including one or more frequencies higher than one or more frequencies in the first frequency range;
• a power source configured to provide power supply for the earphone core;
• and
• a supporting structure configured to support the at least one high-frequency acoustic driver and the at least one low-frequency acoustic driver and keep the at least one second guiding hole closer to an ear canal entrance of a user than the at least two first guiding holes when the user wears the acoustic output device.