In 1995, PreSonus patented digital control over analog circuits with our first studio product. The Quantum’s XMAX preamps offer another advantage: They are recallable. The net result of the XMAX preamp design is high headroom, low noise, wide dynamic range, extended frequency response, and-most important-musicality and transparency. Our discrete design delivers ultra-low noise and transparency. Op-amps add noise, coloration, and harshness to a signal. We only use genuine transistors, resistors, and capacitors. Higher-voltage power rails deliver more headroom, deeper lows, smoother highs, and a richer overall sound. Most off-the-shelf, op-amp-based designs run on power rails of 10V to 18V. The XMAX preamplifier runs on power rails of 30V. ![]() Class A circuits have no crossover distortion and deliver purer, clearer, and more musical results than the Class AB designs that are found in many preamps. ![]() XMAX preamplifiers are built with three key elements: The Quantum audio interface includes eight custom-design, high-voltage, Class A XMAX preamps with discrete components for accuracy and transparency. At PreSonus, we know that the microphone preamplifier is a key component in the sonic quality of a recording.
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