The SM57 is a dynamic microphone and the SM81 is a condenser, needing phantom power. No, phantom power can’t do damage to your guitar. Back in the old days, I'm told they actually used to demagnetize dynamic mic outputs (like the SM57 and others) that had been exposed to phantom power … I have an SM57 and an Audio Technica microphone that requires phantom power, and I'm wondering if I run my phantom power through the SM57 if any damage will come from it? Some users report hissing on recordings. A Rode NT1-A and a Shure SM57. Being a dynamic mic, the SM57 does not need phantom power. The only mics to worry about re: Phantom power, are Ribbons. When I switch phantom power ON it's for both mic inputs. That drastically changes the sound. I would then blend the sound of both to get the best tone. Whichever you choose, all of these options will do a great job of giving your SM57 the additional is gain it requires. Although it shouldn’t damage it, it’s advisable to have phantom power switched off when using this mic. The problem is the Rode needs phantom power and the sm57 does not. Answer. Frequently Asked Questions Does a Shure SM57 need phantom power? So if I do it will I damage my sm57? Find An Answer Browse our vast Answer database for answers to many common technical questions. But you have to assure yourself you’re doing everything right. But if you don't need it, (as with the SM57) turn it off anyway. A professional, balanced, dynamic microphone will not be damaged by phantom power. The SM57 is a dynamic microphone. I would like to use them both, the sm57 closer to the speaker and the Rode a bit more distant.