How to fix muffled audio in Adobe Premiere?

I know some people have had this problem before, but I can't seem to fix it.

When I Import an .avi Video with voice over, the Voice Over sounds muffled.

But the background music I add sounds fine.

When I delete the Voice Over track and add it as either .mp3 or .wav, the Voice Over is even more muffled.

What can I do?

Thanks for your help

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