You can not change sound output. The DVD or BluRay player or BS3 will decode the formats you mention according to the device's capability. Menu Options. Sound. Sound System will display input and output formats.
Beovision 7-55 with Beolab 7-4, 9s and 4000s
Beovision 10-40 with Beolab 1s and 6000s
Beosound 1, 5, 2000, and 3000
Beotime, Beotalk, Beocoms