XMAX preamplifiers are built with three key elements: Most off-the-shelf, op-amp-based designs run on power rails of 10V to 18V. User reviews: PreSonus FireStudio Mobile - Audiofanzine Higher-voltage power rails deliver more headroom, deeper lows, smoother highs, and a richer overall sound. We PreSonus FireStudio Mobile Universal Control use genuine transistors, resistors, and capacitors. Op-amps add noise, coloration, and harshness to a signal. Uninstall the current drivers for the PreSonus Firestudio Mobile if any driver is availablethen disconnect it from[…]