CPC H04R 1/2826 (2013.01) [G01M 3/329 (2013.01); H04R 1/028 (2013.01); H04R 29/001 (2013.01); H04R 2499/15 (2013.01)] | 17 Claims |
1. A closed loudspeaker box, comprising:
a housing;
a chamber, wherein the chamber is surrounded by the housing;
a through hole, wherein the through hole penetrates the housing and communicates with the chamber; and
a plug, wherein at least a part of the plug is inserted into the through hole,
wherein the plug comprises a plug main body and a vent hole penetrating the plug main body, and the vent hole communicates the chamber and a space outside the housing;
wherein the plug main body comprises a head, a neck, and a tail, the neck is located between the head and the tail in a direction along the central axis, and a size of the neck in the direction perpendicular to the central axis is smaller than a size of the head in the direction perpendicular to the central axis;
wherein the tail comprises a tapered portion and a cylindrical portion, the tapered portion is closer to the neck than the cylindrical portion, and a size of the tapered portion in the direction perpendicular to the central axis gradually decreases from the neck toward the cylindrical portion; and
wherein the vent hole penetrates the head, the neck and the tail in the direction along the central axis.
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