Sean ‘Sully’ Sullivan is one of the most revered FOH engineers in the business, having toured with the likes of Beck, Justin Timberlake, Rihanna and most recently Shania Twain and Red Hot Chili Peppers. Here, Sully reveals some of his pro tips for setting up and tuning PA systems, what he’s missing most about being out on the road, and why he's a big fan of d&b audiotechnik rigs.