Bale's Batman voice is suppose to 'disguise' his voice from Bruce Wayne.
There are little microphones on this collar (where the cape meets the suit) to pick up his voice. Speakers are placed in the 'ears' of his cowl. You can kinda see this in the construction of the suit in Batman Begins, as well as any making of/art of Batman documentary/book.
nerd out
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AS SEEN ON TV
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