1) Kaun si namaz buland awaz mein parhi jaye ar kaun si namaz dheemi.
2) Kya har namaz mein Allah hu akber jaha jaha aye woh b buland awaz mein parhna chahiye.

by

1) Morning, magrib and isha namaz for male to be recited loudly. Women if non mehram is not there, she has choice.

2) Allah Akbar first one to be recited loudly, rest normally.