The AMT S3G Studio version combines AMTs Omni Guitar specific microphone system with the AMT AP40 floor pre-amp. The AP40 converts the microphones to low impedance, it regulates the voltage to each microphone, and creates a specific frequency curve in order to maintain the most natural reproduction of sound in conjunction with the achieving the most amount of gain before feedback in a live application. The output of the preamp is an XLR Low Impedance balanced output.