Hi and

to the forums.
DVI does not transport sound.
You will need a seperate cable that goes from the box to either your TV's sound input or some speakers / hifi amplifier.
Look to see at the back. Are there red and white phono connectors?
If yes, then you need a rca phono to phono cable like this:
http://www.cableuniverse.co.uk/catal...12-metres.html
If there is just one mini 3.5mm socket you will need this:
http://www.cableuniverse.co.uk/catal...ndard-05m.html