Why my book uses に in this sentence?


> 私 **に** 聞こえるように大きい声で話してください

Couldn't it have simply been something like:

> 私 **が** 聞けるように大きい声で話してください

?




I recognized as follows for each sentence.

The former sentense, as in your textbook, puts emphasis on the speaker
speaking at loud, and he/she doing so would result in his/her voice conveyed
to 私, without much effort. For the reason described in next paragraph, I felt
it sounds more polite.

The latter sentence, I felt the emphasis is on the 私 being able to listen the
word spoken by the speaker. This sentense might be less polite than the former
because, it seems to more or less connotate that the speaker is asked to speak
at loud all for the sake of 私.

