Introduction
The sound can sometimes get muffled through both earpieces which probably means there is an issue in the speakers. If the speakers themselves are the problem, then there may not be much of a chance of repairing the existing pair. If the speaker is not functioning properly it may need to be replaced altogether.
What you need
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Remove the ear cushions and use a Phillips #2 screwdriver to unscrew the three 5mm screws.
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Almost done!
To reassemble your device, follow these instructions in reverse order.
Conclusion
To reassemble your device, follow these instructions in reverse order.