K20 pro speaker heats up a bit when playing audio in max volume - Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe

Hi,
I have recently bought this k20 pro. Its a beast but i just discovered that when i play audios at max volume, device is feeling warm at the lower right in the back side. And i think its where the speaker is situated. But it is not like overheating or like the processor heats at heavy usage. It is just a warm feeling that i had not seen in any other devices so far.
Is this normal ?
Or only i am having this issue?
Device info:-
K20 pro, december 2019 built/manufacture
Miui 11 out of the box and updated to Miui global stable 12.0.2( latest)
Also had reset after the miui 12 update.

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