An essential part of any loudspeaker system is the enclosure in which the loudspeaker is to be used, often called a baffle. The enclosure provides the proper acoustic circuit for the loudspeaker to ensure maximum efficiency and best performance. The sound coming from the loudspeaker is routed into certain paths and prevented from going into other paths by blank walls put in its way. Thus baffle connotes routing the sound energy. Most of baffles today are built into more or less complex box like structures; hence baffles and enclosures are used interchangeably.