Set up my brand new 4520 this past Tuesday and have been trying to get familiar with it since then and still am.
I have been trying to put it through its paces by playing a few cds, sacds and streams via Roku3.
This afternoon i decided to play a Blu-ray disc that would really test it. I threw in a Lord of the Rings - The Fellowship of the Rings.
Volume was set at -35db. After playing for about 2 hours, the sound suddenly cut off, not unlike an Onkyo receiver hdmi board issue!
I touched the top of the receiver and noticed it was extremely hot. I did not hear any fan. The only speakers shown on the receiver LCD screen were the FL and FR. The center, surrounds and 2 subs were all missing.
I turned it off, and detached its power cable and waited for about 5-10 mins before attaching the power cable and turning it back on and resumed playing the movie with sound restored and the receiver no longer hot but merely warm.
Is this normal behavior?
Does the receiver not have fans that should start when it gets very hot?
I had planned on getting an external fan as an insurance to ensure its longevity but i am still concerned and disappointed it would "fail" in this way without the benefit of an external fan assuming that is the "fix" for this behavior.
I must add, the receiver sits in a space that is about 5" clear on either side and 4" on the top.