Patent ID: 8039725
Filing Date: 2011-10-18
Classification: G10H

Abstract:
1. An electronic keyboard instrument comprising: an instrument main body; a speaker box disposed on said instrument main body; a plurality of speakers disposed at an upper part of said speaker box so as to be directed upward when the electronic keyboard instrument is in use for performance; a plurality of speakers disposed at a lower part of said speaker box so as to be directed downward when the electronic keyboard instrument is in use for performance; one partition plate provided in said speaker box so as to partition an internal space of said speaker box into upper and lower internal spaces; resonance chambers formed independently of one another in the upper internal space of said speaker box so as to correspond to respective ones of said speakers disposed to be directed upward; and resonance chambers formed independently of one another in the lower internal space of said speaker box so as to correspond to respective ones of said speakers disposed to be directed downward, wherein rear parts of said resonance chambers are constituted by said one partition plate.