The vocals were slightly hollow with no separation but I could hear the ladies at all times.
Great casting always helps make a movie a winner so kudos to the person that picked out these ladies; perhaps a second volume will get the additional polishing up it needs to be even better.
In short, The Big Ass Movie had a great deal of big asses on parade that any ass man could appreciate, the execution of the technical matters the only major thing holding it back from consideration of an even higher rating.