I have an older Sharp TV (LC-46D62U)that I am trying to connect to Klipsh analog speakers. When I connect them I hear sound from the TV speakers only. When I go to the menu to direct the sound to the speakers, no options shows up for sending the audio through the external speakers. The owners manual says to connect to the Digital Audio Output terminal on the TV. But the DAO terminal is a vertical slot which will not accommodate any type of round mini plug adapter that has been recommended by third-party sources I have consulted. Any suggestions?