I have a Sony HT-DDW670 home theater system, and recently the center speaker cuts out. I've only had it happen on TV DVD's, not movies - yet. I originally thought that it might be because I was using a 5-speaker setup with DVD's that don't have a dedicated 5-speaker mix, but recently I've experienced it with Star Trek DS9 DVD's that do have a dedicated 5-speaker mix. When I switched it to 2-speaker stereo, there's no problem. I have noticed that when it cuts out, if I turn up the volume sharply using the volume knob on the unit (not the remote) the speaker kicks in and sounds fine. However, sometimes the speaker seems to go dead, then reactivate when dialogue starts again. So, here's what I've got so far: 1. This has happened only with TV DVD's, not movies, but some of these TV DVD's have dedicated 5-speaker mixes, so I don't think it's due to trying to make stereo into 5 speaker playback. 2. DTS appears to be unaffected, which makes me think it's possibly a Dolby Pro-Logic problem. 3. Because cranking the volume makes the speaker active again, it makes me wonder whether the problem may be speaker or cable related. So, what do you think? Is this problem related to the speaker, the cable, the Dolby Pro-Logic II component in the receiver, or just the receiver? I've had this system for maybe a little under two years with no previous problems.