I am only one person, so I obviously can't speak for everyone, but here was my experience.
I was originally a biochemistry major at an engineering school. My GPA there was a 2.85 (Cs in several classes, and a D in calc 3). I transferred to a liberal arts school for my junior year and became a comm dis major. I'll be graduating in April with a 3.92 cumulative and departmental honors. Obviously, there was a huge disparity between my two major GPAs. I wasn't too hopeful about grad school, but I still applied to four schools. I've been accepted to Washington and San Diego, am interviewing at ASU, and was rejected from Boulder.
My advice is to
1) kick butt in any other audiology pre-req classes
2) really try for some personal reflection before writing personal statements. How did you approach your disappointment with those grades? How did you change to improve future grades? etc. Not all of that needs to go in the personal statement, but it was helpful for me to think about. People can usually tell if your statement was well-thought out.
3) apply to a few programs that are less well-known. My advisor thought that I was crazy for applying to programs that were exclusively in big cities in the western part of the country. I am still surprised that I got one acceptance, let alone two.
4) talk to your advisor or a mentor. discuss options, and then relax. Applications are a crazy process. At the very least, you will know if you've done your best.