Loudspeaker with directivity similar to a human talker

[Pang <sound08@xxxxxxx>]

Dear List
 
  I would like to use a loudspeaker with directional properties similar to a human talker to play the speech signals in rooms for speech intelligibility test.  I do not know which loudspeakers have directional properties similar to a human talker. Could someone please recommand a loudspeakers for my work? 
  
  Thanks,
 
   Xing Xing