Sounds feasible however I would assume that if you're using your speakers then you will be plugging in the external power supply. In this case wouldn't power saving settings be not applied? Try having a look in your power settings, disable any power management on ac power and see if you still get pops.
This might stop sounds turning off, if it turns out that it is the power saving 'bug'.
http://www.ziksw.com/soundon/
- The audio chip has powersave mode enabled all the time. This results in the audio turning on and off constantly. This results in pops and clicks. Possible software workarounds.