Quilter Labs Mach2-HEAD MicroPro Guitar Amplifier Head Mach2-HEAD MicroPro Guitar Amplifier Head The Quilter Mach2-HEAD MicroPro Guitar Amplifier Head is not just a game changer It is the game changer Pat Quilter spent hours analyzing what makes some of the greatest vintage amps so great Then he developed analog technology that re-creates these voices and delivers unprecedented tone shaping options