Latitude E6420 audio volume is very low and tinny
I'm getting only minimal sound from the internal speakers of my Latitude E6420. The volume is very low, even though it's set to the highest level. Also, the sound is tinny. It's similar to what you hear from headphones at a distance; like when someone near you is listening to headphones at a high volume, or if you take off your headphones/ earplugs while the audio is still playing.
Whenever I actually use headphones, the sound is great, but with the internal speakers the audio is practically nonexistent.
I've set the internal speakers as my default speakers, I've adjusted the loudness equalization, and I've reinstalled the audio drivers. I've even tried wiggling a toothpick inside the speaker jack, but nothing has resolved this issue.
Can anyone help?