The system cannot process dolby digital 5.1 on its own. You need an additional decoder, some dvd players do have these built in - look for jack sockets that will accept your 5 speakers on the rear panel, they should be marked Left, Right, Rear Left, Rear Right, Centre and Subwoofer. Superfi have a Helios H4000 dvd player that will do this but it is currently £80 (October 2007). You could also look at getting an amplifier/processor but this will cost alot more than the £30 Mikomi surround sound Argos are selling! My advice is to return the unit. They really should advertise that the speakers require extra technology to work afterall! Hope this helps guys...
Gavin
October 2007