Insert a ProMIX between the mics and the mixer. Each mic channel on the ProMIX has both phantom power and low-frequency cut selectable via DIP switches plus a level control. The balanced XLR line output can be connected to a mic input on the mixer and headphones or a powered monitor can be connected to the Phone/Aux output. And if AC power is not available, the ProMIX runs on batteries as well. Includes: MacroMIX Four Channel Personal Mixer - Adapter - Art Pro Audio 3 Year Limited Warranty Specifications: Signal To Noise Ratio: > 90dB Maximum Gain: +40dB Input Impedance: 10K Ohm IMD (SMPTE): <0.008% Power Requirements: 12V DC (Adapter included) Total Harmonic Distortion: <0.008% Dimensions: 5.63 x 3.75 x 1.75 (143 x 92 x 45mm) Weight: 1.6 lb (725g)