| 摘要 |
A speaker housing includes an air-impermeable first chamber in which first and second speakers, each having diaphragms which vibrate in operation, are so mounted that the rear surfaces of the diaphragms of both speakers face the inside of the first chamber and the front surfaces of the diaphragms of both speakers face outside the first chamber. The axes of the two speakers are perpendicular. The front surface of the diaphragm of the second speaker faces the inside of a second chamber in the housing which includes a slant board oriented at an angle to the axis of the second speaker. The two speakers are driven such that the sonic pressure wave off the rear surface of the diaphragm of the first speaker is effectively coupled from the air-impermeable first chamber through the second speaker, maintaining the pressure within the air-impermeable first chamber substantially constant. The sonic pressure wave off the front surface of the diaphragm of the second speaker strikes the slant board, reverses phase and is directed out of the housing with substantially the same phase as the sonic pressure wave off the front surface of the diaphragm of the first speaker.
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