A fully integrated, low cost, amplified electro-acoustic loudspeaker is disclosed in which an amplifier circuit (30, 130, 230, 330, 930, 1030), radio-frequency receiver amplifier circuit (430, 530), optical receiver amplifier circuit (630, 730), or network based amplifier circuit (830) is directly mounted...http://www.google.com/patents/US6243472?utm_source=gb-gplus-sharePatent US6243472 - Fully integrated amplified loudspeaker
