[教學] Onkyo AV amp calibration suggestion

Having used Onkyo AV amp for over 5 years, I always find the sound is a bit muddy
Recent trial found some serious problem not mentioned in any guide or manual
For calibration, we have to keep the environmental sound very low
Hence always perform at mid night
That is the problem when we just switch on the amp at middle of night and start the calibration
The sound quality is a lot difference when the amp is cool compared to when it is hot at working temperature
Next time, try to calibrate the amp when it is running for some time and hot
The result is amazing
I don't know whether this applies to other brands as well

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