Report Hooking Mac Mini Into Surround Sound in Mac, iPhone, iPad, iPod Posted April 14, 2009 ok the audio is being sent out raw? I would think there would be some way to change it over to PCM or what ever. It is going out via a toslink or optical into my 5.1 audio home receiver. It says it is getting a digital reception on the receiver. But I want the audio to be 5.1 all the time not 2 channel and then when I play DVD's it is 5.1.PCM is RAW... Also you have to set up audio on most DVD's to do 5.1 as they revert to stereo for default. also are you sending this audio to a TV then to a separate audio system.. if so under HDCP processing stereo is all you get.