Originally Posted by strtgng
So to continue the above saga, my troubleshooting tasks became much easier last night. After working flawlessly as a HDMI switch since I last posted (with no speakers connected) the Denon went into protection mode in the middle of watching a movie. No warning, no inputs or volume changes at the time - just a sudden outage. The unit had been on for 30 minutes tops and was cool to the touch. The protection circuit blinked the "speaker short circuit" flashing as usual. All other components stayed powered on fine. I powered the Denon back up immediately and it resumed functioning as normal. So I've just eliminated any speaker issues from being the cause, as there are none hooked up - it is routed to provide audio output externally and not use the amp.
So I guess I am down to some strange power issue which doesn't impact any other electronic component in the house, or an HDMI cable issue (not even sure if this is possible, as they all work fine when the Denon is removed from the loop, or some sort of intermittent flaw in the circuitry of the Denon that might takes weeks - if ever - to reproduce in a test environment. I strongly suspect I simply have a $400 paperweight that I won't be able to get any relief from the manufacturer on even though it is less than 3 years old. As much as I loved the Denon, I'm not supporting them by buying another Denon product after this experience, so does anyone have any good $400 non-Denon AVR recommendations? Or, since my 13 year old Kenwood AVR still works fine, but lacks HDMI inputs, I might just get a HDMI/Optical switch box to send the HDMI signal from all my sources to the TV and the audio to the Kenwood. Any recommendations on that type of equipment? I saw on Amazon a box for about $80.
I too am experiencing a strange thumping noise that may have the same cause as yours.
A couple of months ago the system started making thumps/bangs randomly every 1-3 seconds. Annoying but not the end of the world. It didn't happen often, about one evening per week, and once it started it lasted about half an hour.
It's been getting worse, louder thumps and more evenings per week.
Last night for the first time the protection kicked in after the loudest thump yet.
I played around and found the following strange observation: I have a 4.0 setup and even when I have only the front speakers turned on (e.g. direct/stereo/pure on a stereo digital optical source), the thump comes from the back speakers too. This of course eliminates the source as being the culprit. Also the speakers or cables themselves are not the culprit because the same happens when I use the Denon's headphone jack.
I've yet to try as many things as you (e.g. factory reset) as it's hard to diagnose when it only happens one or two evenings per week.
I will keep you updated with my findings; kindly do the same to me.
Thanks and regards