After upgrading to Mavericks (from 10.7.8), I get a popping sound on my speakers even with mute.  Suggestions?

I've never had an issue with my sound on my MBP 15" 2011 model until I upgraded to Mavericks.  Shortly after I upgraded, I started getting a 'popping' sound coming from the speakers even with the volume muted.
I'm trying to figure out what could be causing it by eliminating running programs but no luck yet.  So far I've tried:
disabling graphic switching
disabling the Flash plug in for Chrome
Checking Voice over settings in accessibility (off)
Killing coreaudiod
So far, only killing coreaudiod has worked for any length of time.
I'm not playing a sound, I have nothing in the background that's generating sound (with the exception of MS Office 2013 running in Parallels generating meeting notification alerts - that seems to cause part of it) but something is obviously triggering it.
Thoughts?  Comments?  Suggestions?

Might be corrupted audio preferences ..
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following;
/Library/Preferences/Audio
Click Go then move both .plist files from the Audio folder to the Trash.
com.apple.audioDeviceSettings.pllist
com.apple.audio.SystemSettings.plist
Restart your Mac. See if that made a difference ...

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