What prefix goes in front of audible?

The prefix that goes in front of "audible" depends on the meaning you want to convey. Here are some options:

* In-: This prefix means "not" or "the opposite of." So inaudible means "not audible" or "unable to be heard."

* Un-: Similar to "in-," this prefix also means "not" or "the opposite of." So unaudible also means "not audible" or "unable to be heard."

The choice between "in-" and "un-" is usually based on preference or the specific context. Both are commonly used and grammatically correct.