Sound issues with Macbook

I have a Macbook.  Recently the sound on my Macbook has become very quiet and lacking in bass.  I have checked all sound settings.  The issue persists in OSX and Windows.  The issue occurs with both speakers.  Laptop has not been dropped or abused.Sound

The fact it happens both in Mac OS X and Windows, and I'm assuming you mean Boot Camp windows, suggests it is a hardware issue.  If you are using any other virtualization tool, check your Audio Midi tool settings in application found in your Applications -> Utilities folder on your Mac.  It can affect the sound out in numerous applications. If the machine is over 4 years old, have the PRAM battery replaced.  If none of this appears to help, bring it in for service.

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