The fourth set of hopefuls audition with the judges only able to hear their voices and not see how they look. The judges have to select ten different acts during the course of the auditions that they would each like to mentor. If more than one judge are impressed by the same act then the act has to decide which judge they would like to be mentored by. 4 link(s) were found on The Voice (Australia) S2 Ep. 4.