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I grasp that you are running Windows 10 and you have a crackling/static noise from the speakers.
Did this come with Windows 10 installed or did you do an upgrade to Windows 10?
Have you done all your Windows troubleshooter?
Have you ran the HP Support Assistant ?
Have you done all your Windows updates?
Here is a link to Open the Windows Update troubleshooter that may help find additional drivers. Although it lists Windows 7 it does work in Windows 10.
Once launched, it should show a screen like this.
Use the second option "Background Intelligent Transfer Service", it should lead to a force update of 'Windows Updates' that may not be automatically being applied, that could fix some of these issues.
If you connect external speakers do you have the same issue?
If you would like further assistance please provide your exact model of HP Spectre X 360 Ultrabook and any additional details.
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Best of Luck!