Do you think it's possible to fall in love with someone's voice?

Yes. I'm not a visual person either.
But it also indicates a lack of meaningful IRL interactions, almost always.
 
I think it is possible for the person to create an idealized mental version of the speaker, and develop emotions over time. It is just a factor though, when you introduce more, that may change, like if you learn that this beautiful voice comes from a liar/criminal/etc, maybe your perspective will change.

A good example was Cryaotic: very likely that some fans of his fell in "love" with his apparent personality, but also heavily aided by his voice; if he sounded like drugged out Micky Mouse, maybe he would not have had these fans.

When you have no more information, like if you hear someone singing, I believe you can fall in love with them, it is when you start to learn more about this person, that this emotion can transform into something else or fade completely.
 
I submit Kathleen Turner and Jennifer Tilly as my evidence that yes you can fall in love with the voice.
 
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