@PENG - That's actually great advice. The problem is new users will not have the knowledge to test each feature/hardware section on a Denon AVR. Think about that process for a moment. Even if you knew what you were doing it could easily take several hours to a full day to test every function/connection and you may still miss intermittent problems. Here's a short list:
1. Check every channel with speakers.
2. Check every Pre-out.
3. Check every input: USB, RCA, optical, HDMI.
4. Check each sub out.
5. Verify all network features are working. (Airplay, UPnP, Bluetooth, wifi)
6. Verify front panel buttons work.
7. Stress test to look for intermittent audio/video issues.
I guarantee those Denon Refurbs are not getting this type of testing when they drop the ticket in the box saying it was tested by tech XYZ and offer a phone number to call that no one answers.
These AVR's are complicated. I would guess most buyers don't use 20-50% of the features.
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