Electronic keyboard instrument has recess on upper portion of back panel, extending in direction in which keyboards are arranged

摘要

A speaker is mounted to a speaker mounting hole (6) which is formed on the wall surface of a back panel (4). A porous speaker cover (8) is mounted in front of the wall surface. A recess (9) extending towards the keyboards, is formed on upper portion of the back panel. A locking edge (8a) formed by bending upper edge of the cover is fitted into the recess and lower edge of the cover is fixed to back panel by a screw (11).