Speaker sound like a hell sound cracking and not clear ( outdoor mood off) I'm scread to give my mobile to service center Because I have seen service center not taking proper care of devices.
Hi, make sure you aren't using outdoor mode ^^
Try screen recording by inbuilt screen recorder and play a song or anything while recording. If you have any thing on by accident, screen recorder will bypass that and will give you the original audio from the speakers. If while recording the sound remains cracking then show it to the service center.
While listening to a song try screen recording as it will bypass any audio EQ you have on by any accident and if the issue persist then take it to the service center.