Default strange audio problems

Got back from warranty my htc one, but it have same issues with audio from 3.5mm jack, left side on headphones or external speakers gives cracking sound. What it should be?Headphones on other one working perfect. Sorry for my poor english.Thanks
SE Xperia X10 + 8GB 6Class microsd
Rooted, CM7
ZTE Blade\SF + 4GB 4Class microsd
Rooted, CM7
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