loud speaker isn't give clear sound?

when you put too much volume to your phone it will create distorted signal as it goes pass to the limit audio level that’s why it does sounds awful try to lower it down if the make it clear then there are no issue with your speaker if it stays the same distorted sounds well that has to be changed but it need a bit of experience to change the loud speaker as it involves a lot of tiny components insides which doesn’t need to be disturb or damage as you could create another issues instead of fixing it…. bring to the professional repair phone store for a proper diagnose and for peace of mind let them fix your phone instead