Hello. I just starting to build a live sound pa system to play music in a band Im with now. Im noticing that when I have to sing a high note, I have to back off the mike and it seems the sm 58 type of mike IM using isnt working because of that very reason. Does anyone know whether I can go ahead and buy a Shure KSM9 condenser vocal mike and use it on stage. Will I get feedback easily. Thanks. Paul wa state.