The front panel setup can be used. The DCX2496 does not come pre-configured so you will need to manually adjust these settings by using the setup button on the front panel. Such options should be under routing for each separate channel.
Currently, I am away from my DCX (and will be until Sunday), basically you need your input/output configuration to look like this:
Just make sure the input/output plugs are in the right spot and you shouldn't have any issues.
If this does not work what are you referring to by L and H outputs?