Yes, you can run the mics directly into the JB3 as they're powered by their own battery box. You may find as others have that the mic-in analog stage of the JB3 - the bits inside that add gain to your mic signal before it's converted to digital - isn't the greatest. You may also find the ADC isn't the greatest. Or you may love it. I say if you're on a budget, give it a go.