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The above advice is good but please try this first: Main Menu > Settings > Apps > All > Sound Enhancements > Clear Data.
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Repair phone software with sony update service or pc companion.
I buyed my Z1 on 4 jan 2014... upgraded OS to 4.3... After upgrading to 4.3 I also face similar issue.
so I did factory reset. Now everything is same.... dont worry your OS will NOT be reverted back but al your contacts, msgs, calender enttries and accounts will be gone...
so better make a backup everything stored in phone memory.
settings>backup & reset>factory data reset
You need to repair via pc companion or sony update service.
You can restore most of the apps after a repair.For now,it seems only a repair of the software fixes sound enhancement.
Ok,your call.