If the speaker of your Echo Dot 3rd Generation sounds muffled or is distorted in any way, the speaker may need to be replaced. Follow this
Echo Dot 3rd Generation Speaker Replacement - iFixit Repair
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Teardown: The 2nd generation Echo Dot
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Don't even try to repair Apple's HomePod
Echo Dot 3rd Generation Speaker Replacement - iFixit Repair
/docs/2019-07-20--echo-dot
Echo Dot 3rd Generation Speaker Replacement - iFixit Repair
Echo Dot 3rd Gen Disassembly - iFixit Repair Guide
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Echo Dot Speaker Replacement
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Echo Dot 3 Mic/LEDs/Button Replacement - iFixit Repair Guide