Einleitung
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.
Werkzeuge
Ersatzteile
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Remove the ear cushions and use a Phillips #2 screwdriver to unscrew the three 5mm screws.
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Insert new speaker and solder the five wires into corresponding positions onto the new speaker.
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Abschluss
To reassemble your device, follow these instructions in reverse order.