(Sierra) Loud popping sound on boot

CPU: Intel i5-3550 Mobo: Asus P8B75-V Sound: Realtek ALC887-VD2 GPU (irrelevant, I think, but anyway): GTX 550 Ti Currently sound is working with the help VoodooHDA. Everything works fine, both front and rear panels, but annoying issue is a loud popping sound at boot time (around the time OS detects GPU and LAN, according to verbose boot log). OS version is 10.12.6. System definition is iMac 13,2.

submitted by /u/romasheg
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