Had the same problem with audio tearing on a Windows 10 desktop box (A10 chip, Asrock mobo) with Realtek audio on the motherboard. The tearing and stuttering happened moreso in Firefox than Chrome. In BIOS, I disabled HDMI audio as the monitor uses a VGA connection and audio is fed to an external amplifier via the backpanel socket. It seems to have cured the problem.
Regards...jmcc
Regards...jmcc