Originally Posted by cec68
Got this the other day, set it up for my 5.1 sound and ran the audyssey set up. Watched Inglorious Basterds and Avatar, everything sounding great. Well tonight I put in Tropic Thunder, started playing with the different sound modes and now my surrounds have no sound at all. Went to set up menu to calibrate speakers and when I highlight the surrounds, nothing at all. Did the audyssey set up again, and when it gets to the L and R surrounds it does nothing as if the speakers are not wired in. Yes I have changed the speakers and none of them work on the surround post. I have also reset or cleared the 608 and unplugged it. Still same problem, no sound. Can someone please help?
I had a similar problem with the Pioneer vsx-920 I just got ... not sure it's the same issue you are having but just in case, I'll mention it. I listened to a 2-channel audio / music CD and was experimenting with the various ProLogic settings on the remote. Afterwards, I couldn't get any sound out of my center, rear channels, and sub. I tried switching inputs to 5.1 content (e.g., bluray, regular DVD, and TV) but only got 2 channels on everything (the front mains). Like you, I turned the unit off / on, then unplugged it, restarted, and still only 2 channels.
Finally, I manually checked the speaker setup and discovered the receiver had developed a mind of its own and set all of the other speakers to "No", a setting which essentially means they don't exist (i.e., you use the "No" setting if you don't have back surrounds or a sub, for example). Once I turned the speakers back on, everything worked fine again.
I have since tried repeatedly to duplicate the problem and haven't been able to as yet ... tried playing the 2 channel music CD again, played with the PL settings, etc., and it hasn't arbitrarily turned off speakers again. Go figure?