My iPhone 4s Speaker Sounds Fuzzy?

I've only had the phone since late March, and it was bought directly from the store, brand new. At first the speakers were fine, but in the past few weeks whether it's talking on the phone or playing music, the sound has static/a fuzziness to it. I've been incredibly careful with the phone, haven't dropped it and made sure to buy a heavy duty case. What's wrong?

Could be Dust or water damage in them. Or You have EQ on

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