Headphones with frequency-based divisions

A headphone, comprising

• an earphone casing and a sounding module in the earphone casing;
• the earphone casing including an accommodation room, the accommodation room including a front end opening at a front end of the earphone casing, a rear end of the accommodation room including an annular partition, an exterior of the annular partition including a first rear cavity, a second rear cavity between an exterior of the annular partition and an inner wall of the earphone casing;
• the sounding module including a main body and a loudspeaker assembly mounted in the main body;
• the main body including a baseboard portion and a first annular portion connected to each other, the baseboard portion and the first annular portion jointly defining a front cavity surrounded therebetween, the baseboard portion with a through hole penetrating two sides of the baseboard portion and the front cavity;
• the loudspeaker assembly comprising a yoke, a magnet, a washer, a voice coil, and a diaphragm, the yoke, the magnet, the washer, and the voice coil mounted corresponding to the through hole, the diaphragm connected on the voice coil and located in the front cavity;
• the baseboard portion with more than one first auxiliary air hole, the first auxiliary air holes located beside the through hole and corresponding to an outer side of the voice coil, the first annular portion with more than one second auxiliary air hole communicating with outside, the first auxiliary air holes and the second auxiliary air holes covered with a piece of soundproof paper, respectively;
• and
• the sounding module installed in the accommodation room, the main body disposed on top of the annular partition, the through hole being aligned with the first rear cavity inside the annular partition, the second auxiliary air holes in communication with the second rear cavity, the annular partition located between the first auxiliary air holes and the second auxiliary air holes;
• a frequency division cavity among an outer side of the main body, the annular partition, and the inner wall of the earphone casing, the frequency division cavity with a third auxiliary air hole at the front end opening of the earphone casing.