Micro-speaker box

1. A micro-speaker box, comprising:

a cabinet defining a cavity room;

a speaker unit attached to the cabinet, and including a magnetic unit having a yoke, a vibrating unit corresponding to the magnetic circuit unit;

an adsorbent located in the inside of the cabinet;

a porous layer arranged in the cavity room and dividing the cavity room of the cabinet into two parts, one part for accommodating the speaker unit, the other part filled with the adsorbent which includes a second hole;

the speaker unit wrapped by the porous layer for preventing the adsorbent from entering the speaker unit;

the porous layer defining an acoustical airflow resistance no more than 150 MKS Rayls, and including billions of stomas;

the stomas in the porous layer having diameters in the range of 1 um to 500 um;

the yoke having a first hole communicating with the other part of the cavity room through the porous layer;

the cabinet further including a panel arranged in the cavity room for firmly fixing the speaker unit, the panel including a third hole for communicating with the first hole through the porous layer and a second hole, respectively.

2. The micro-speaker box as claimed in claim 1 , wherein the stomas in the porous layer have diameters in the range of 11 um to 39 um.

3. The micro-speaker box as claimed in claim 1 , wherein the stomas in the porous layer have diameters in the range of 41 um to 49 um.

4. The micro-speaker box as claimed in claim 1 , wherein the stomas in the porous layer have diameters in the range of 51 um to 99 um.

5. The micro-speaker box as claimed in claim 1 , wherein the stomas in the porous layer have diameters in the range of 201 um to 500 um.