Notebook computer speakers

Abstract

A loudspeaker configuration for a notebook computer includes one or more high frequency 'upper' speakers and a low frequency 'lower' speaker. The upper speakers are mounted within a display housing and emit sounds over a range including directional sounds having wavelengths less than one-third the upper speaker diameter. The 'lower' speaker is mounted within a keyboard housing. The lower speaker is oriented downward onto the desktop or other support surface and displaces a larger volume of air than the upper speaker. Open space between a processor board and a lower housing base surface define an internal speaker-box chamber for the lower speaker. The housing base surface and a support surface for the computer defining an external speaker box for the lower speaker. The internal speaker box and external speaker box define a band pass acoustic filter for sound waves emitted from the second speaker. The sound waves passing through the band pass filter occur to a listener as non-directional sound. The directional high frequency sounds emitted from the upper speaker(s) are enriched with the non-directional sounds of the upper and lower speakers, resulting in improved sound quality.