| 摘要 |
PROBLEM TO BE SOLVED: To adjust frequency characteristics of a speaker without requiring complicated operation.SOLUTION: Ports 31 and 32 are provided on a side face 16 and a side face 17 which are confronted in a length direction of a speaker 10. An open end 33 in the port 31 is spread smoothly toward the outside. The open end 33 is exposed through the side face 16 to the outside. An open end 34 in the port 32 is also spread smoothly toward the outside. The open end 34 is exposed through the side face 17 to the outside. A length of the ports 31 and 32 is shorter than a half of the distance between the side faces 16 and 17. An inner diameter of the port 32 is thinner than that of the port 31. |
