Angle changer
Angle changer is a speaker capable of changing the angle to 0, 15 or 30 degrees without mechanism but only by its three-dimensional tetrahedrons characteristic. Why should a speaker have fixed angles? A user is required to adjust the angle of a speaker in accordance with sitting height due to the straightness of the sound property, so I suggest angle changer. It is capable to change the angle of the speaker by simply turning it over. Depending on which side the tetrahedron speaker faces ground, the user can acquire optimal sound effects.
