Sorry I should have been more defined. I should have asked if you are using a DJ or Live Mixer. When I hear Mic and Mixer I usually associate the Mixer with a Live Mixer. I know those two and four channel GTD Mics may have the ability to premix the Mics to give one or two consistent outputs. The problem with that, to me, is that if you are using all four mics, those four people may all have different levels of speaking. This is one of the reasons to have a suitable Live Mixer that can manage individual inputs and outputs as need. If you don't have a Live Mixer you may want to consider one. Get one that will not only accommodate all the Mics you are ever going to use at one time but also will accommodate the outputs from your DJ Mixer. What type, Make and Model of Mixer do you have anyway?