I have an LED light-bar to illuminate the equipment in my HT rack, but it washes off the glass of the equipment door in a way that gives a milky, foggy appearance. So I added a push-button to my light/fan controller so the light can be turned on as-needed. I put the button under the decoder status indicator, so it is a beacon of sorts.
If you can perform the firmware update to add Dolby Atmos to your AVR-4520CI, I suggest you do so.
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