A high quality sound system for installation into the bay of an existing computer including a front panel supporting a pair of speakers. A sound focussing isolation unit having a mouth opening up on the front panel is positioned between the speakers and has a throat communicating with a reverberating...http://www.google.de/patents/US5710821?utm_source=gb-gplus-sharePatent US5710821 - Audio communications system with built in expansion capability for a desktop computer 
