Loudspeaker systems

Claim 1

A loudspeaker system comprising: a loudspeaker secured to a mounting board and connectable to a source of audio frequency electrical signals, said loudspeaker including a movable loudspeaker diaphragm having an exposed front face for producing sound waves to be transmitted into a listening area and a back face, said diaphragm being controllably energizable in response to audio frequency electrical signals from said source, and a partly inflated, thin, slack, lightweight, easily movable, substantially air-impervious plastic baglike member which completely encases the back face only of the movable loudspeaker diaphragm and serves to form a closed air chamber behind the back face only of the loudspeaker diaphragm, thus being free to produce sound waves for transmission to a listening area, said plastic baglike member having a size and being partly inflated to an extent such that it will not collapse against the back fAce of the loudspeaker due to movement of the air in said closed chamber when the loudspeaker diaphragm moves in a forward direction and will not stretch tight or become rigid due to compression of the air in said closed chamber when the loudspeaker diaphragm moves in a rearward direction thereby to substantially prevent compression or rarefaction of the air in the closed chamber which would tend adversely to affect the sound wave producing movement of the front face of the loudspeaker diaphragm.