No clue. A review of Digidesign's website makes damned little mention of the mic preamp at all, and gain specs and signal to noise ratios are simply not available. I would email Digidesign and ask them how much gain the mic preamp produces. If it's less than 65db, I would look for a different mic. There's no doubt- this thing was designed for guitars, and the mic input is an afterthought. It'll definitely work with some mic, but the SM7 probably wouldn't be my first choice, as a guess.-Richie