Well exactly what the title says, i dont have 5.1 surround sound on the Logitech Z-906 when Dolby Digital is enabled.
i have the Creative Sound Blaster Labs X3 thats connected with my pc over usb. From the x3 there is a digital cable to the z906.
If i set the audio quality to something other than dolby digital i will get 5.1 but not if dolby is selected,
English is not my first language and this is my first time on a forum so if i do something wrong please let me know.
Hey! it is very stupid but you have to use your remote ^^. Be sure you are sending 5.1 material (netflix/videogame/etc...) and then with the remote you can select the mode and you will see the "decode" LED on.