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Re: inspiron 15 5000 crackling sound

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See my post here...
DPC latency on Dell G5 5587, not just XPS

The main issue is the Realtek audio drivers - they're complete garbage. This has been a common problem with virtually every laptop (not limited to Dell) made since 2015 that comes with a Realtek audio controller. You can switch over to the generic Microsoft HD Audio Device driver which will fix the problem, at the expensive of less/basic features. However, chances are that after a few reboots, Windows 10 will force the proper driver back on your computer (along with the WavesMaxx program), and there is no way to stop Windows from doing so.