Hi HamedNet,
Welcome to sony Community!
We're sorry to hear that you are having an issue with the audio quality. Have you followed the proper system upgrade from Sony? When did the issue start? you may do a system restore back to the date when the audio is still working as it should. If the issue still persist then a full reformat is advised.
We kindly recommend visiting our Sony Global Web site for information on contacting the Sony Support Center in your region at http://www.sony.net/SonyInfo/Support/.
Regards,
Jen
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