have a look on your remote for any sound effect / surround effect buttons,
you may need to change "downmix" settings inside the player menu for this to work,
all the moden ones have this, the old ones are hit and miss,
I work for a retail company that sells tv/audio in cannington so if you wanna have a look at whats new out there send me a PM
EDIT: just spotted something, on the dvd player, just under the yellow video lead, is that an orange coax digital conector, if so you may be able to get a optical to coax converter.
EDIT2: this may not be the exact one to suit your needs, but just as an example
http://www.ebay.com.au/itm/TOSlink-O...-/221156873861