Tell if this is earpiece or audio chip (ic) fault in iphone 5s?

I have iphone 5s & iphone 4, i have experienced that in call volume & ringer volume is little bit lower in 5s than 4,
in voice memo and video recording sound is aloud in music player sound is loud enough,
please tell where is issue in earpiece & ringer or in audio chip?

Different apps have different settings. If the issue were the earpiece, you wouldn't hear anything at all, and the volume wouldn't change with the application.

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