Quantifying Achievements
Stating the number of shows you've overseen audio production for provides tangible evidence of your experience. By adding that you consistently deliver 'crystal clear sound', you're showing your commitment to quality, which is an essential trait for an Audio Engineer.
Highlighting Scale of Experience
By specifying the size of the events you've managed sound for, you're indirectly telling recruiters about the scale of your experience and your ability to handle pressure. It's not just about the skills, but also about how effectively you've used them in large, stressful environments.