After some debating i'm stumped again. I bought an Onkyo-605 and have it setup as follows
PS3 -> HDMI -> Onkyo
Onkyo -> HDMI -> TV
When i put a game on eg. GTA IV, the Onkyo says 7.1 which is awesome. You can really tell the difference in sound quality from 5.1
Blu-ray is also great (even though its only 5.1)
Here's the problem.............. Games/Blu-ray work great! however, if i download a trailer from the PSN, there is no sound. Also standard DVD's also have no sound. Its not all DVD's but some older ones. I tried using an optical cable instead to the Onkyo and then everything works fine but no 7.1 on games only 5.1
i know its a bit petty but i paid for a 7.1 system and i personally think its more immersive. Please help!!!!!!