I have a quick question, I have a gig coming up but I dont have any mics. My plan is to use my spd-20 with kd-7, a snare (12x5 pearl firecracker) and my hihats. I have a fender (dont know exact name) pa speaker that I will run the spd-20 through. The speaker have 3 mic inputs. The question is this, can I run a shure sm-57 through the pa input? do I need a mixer? I am a complete noob when it comes to live sound/ recording.