iMac buzzing when connected to the external amplifier

I have external amplifier connected to the new iMac 5K retina. When he plays music or sounds of any kind, through speakers, it's all good.

However, if you do not play any sound for 20 seconds, it is very light buzzing sound from left speaker only. I logged out (model end 2012) iMac and it works exactly the same.

This is NOT ground loop or bad cable/amp problem (amp and iMac share same multi socket). It seems that something in the iMac will sleep, open the circuit, making the high output impedance, making the left channel pick up noise from the power grid. HiFi, impedance of the output device installation is low, effectively killing most of the HF/RF interference in the cable.

It is very annoying problem that I scoured my decent sound, high-end amp/speakers. Any ideas or solutions (Apple I hope you read this too, it's unacceptable on 2000USD + machine).

Apple is not reading this. This is a user forum. Certainly, this looks like a bad cable from your description.

Tags: Mac

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