| 摘要 |
PURPOSE:To obtain localization close to a grand piano, etc., without deteriorating pitch characteristics of speakers while using the high-register and low- register keyboard side speakers having nearly the same output characteristics by arranging a specific cabinet for a low register range. CONSTITUTION:The electronic keyboard musical instrument is constituted by arranging the speakers 53 and 55 which have nearly the same output characteristics on the low-register keyboard side and high-register keyboard side; and a through hole 47a on the low-register keyboard side of a rack plate 47 is bored in the reverse surface of the rack plate 47 and the cabinet 57 for the low-register range which increases the sound volume of the low-register range of the low-register keyboard side speaker 53 is arranged. A duct 61 is formed in the bottom surface 57a of the low-register range cabinet 57, which is constituted into a bass-reflex type cabinet. Therefore, a sound wave from the front surface of the diaphragm 53a of the low-register side speaker 53 is inverted in phase by the duct 61 and radiated downward from the duct 61. Consequently, the sound volume of the low-register range of the low-register keyboard side speaker 53 is increased to obtain the localization which is closer to a grand piano, etc. |
