Besides the possibility of high volume listening levels , what are the loads ( in ohms) connected to the speaker outputs?
Do they match with what the amp says?
Are the speaker wires firmly attached at both ends?
Your Denon receiver may be going into overload, which comes from playing it too long, and too loud. Try reducing the volume to 1/2 your normal level. If you still have issues or questions, please visit my website at audioserviceclinic.com. Thank you.
If you are running your Denon close to it's maximum power output, also known as clipping, when a louder program material comes along, often containing more bass content, the amplifier has no more power(the calculation is P=EI, or power equals voltage times current(measured in amps), which all basically means, your amplifier does not have the capability to produce more output. As this is all happening, there are thermal sensors, near the output components, measuring heat. When the receiver gets too hot, it simply shuts down to prevent damage. I could go on, but the main point is, you will need an amplifier with, at the very least, 3 times the power, which will give you 6db of gain. I can explain it more if you'd like to visit my website.
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