A:
It is not permissible to
prolong the "ba'" when saying "Allahu Akbar" in the Adhan or in anything else. This involves distortion of the required meaning as it will bear the meaning of the plural of "Kubr" which means drums in Arabic as stated by scholars. It is, thus, necessary to prevent that man from pronouncing the Adhan and to search for someone else who can do it in the right way.