Pass Labs XP-20 manual

XP-20 Owner’s Manual

DISPLAY: The default setting for the display is “bright”, pressing the “DISPLAY” button once changes the display to it’s “dim” or “low intensity” setting, pressing the button a second time selects “off ” for the display. When “off ” is selected any other control function will cause the display to indicate product operational status for approximately 7 seconds and then the display will once again blank.

Pressing the “DISPLAY” button a third time cycles back to a “bright display”.

We recommend the use of the balanced output mode where possible. Balanced input to power-amplifiers will typically retain the character of the input mode, but offers less distortion, less noise, more gain, and more voltage swing, without compromising the sound.

With balanced operation, the common mode rejection of the preamp reflects the intrinsic common mode rejection of the topology, the matching of the gain devices, and the matching of the attenuator channels. In this case we have been able to keep the total mismatch to about .1%, for a common mode rejection of approximately -60 dB.

The input system of the preamplifier will exhibit full common mode noise rejection with passive balanced sources, where the negative input is connected to ground at the source through the appropriate source impedance. This allows adaptation of unbalanced sources to balanced operation with passive cable connections in a manner that achieves the superior noise rejection of active balanced sources.

The use of a micro-controller allows all of the preamplifier functions to be repeatable and accurately controlled. The microprocessor only controls the functions of the preamplifier. At no time does any of the input or output signal come into contact with the digital control signals.

The digital circuits are powered by a power supply that is isolated from the analog supply. Should it ever be necessary to update the software that controls the functioning of the preamp only the socketed micro-processor need be changed.

Rugged mechanical muting relays, which delay connection during turn-on and shut off the output when insufficient power supply is available to maintain regulation, guard the output of the preamplifier and offer protection to the power-amplifier and loudspeakers.

The XP-20 consists of two chassis, shipped in a single box.

XP-20 specifications

The Pass Labs XP-20 is a high-performance preamplifier that embodies the sophisticated engineering and design philosophies of its founder, Nelson Pass. Renowned for its exceptional sound quality and performance, the XP-20 is an evolution of its predecessor, the XP-10, and is designed to meet the needs of audiophiles and music lovers who demand the very best in their audio equipment.

At the core of the XP-20 is a fully balanced circuitry design, which allows for improved signal integrity, reduced noise, and enhanced dynamic range. This balanced topology not only minimizes distortion but also ensures that the audio remains pure and true to the source material. The preamplifier features dual differential gain stages, which contribute to its remarkable clarity and transparency, making it a perfect partner for high-end power amplifiers.

One of the standout features of the XP-20 is its extensive input and output options. The unit includes multiple single-ended and balanced inputs, ensuring compatibility with a vast array of audio sources, including CD players, turntables, and digital streaming devices. The outputs are equally versatile, allowing for easy connection to power amplifiers or active speakers.

Another key characteristic of the XP-20 is its massive power supply, which provides the necessary current and voltage to drive the preamp's demanding circuitry. This robust power supply is designed with low noise and high regulation, ensuring that the unit operates efficiently while maintaining sonic fidelity.

Furthermore, the XP-20 incorporates advanced volume control technology, allowing for precise adjustments without compromising audio quality. The volume control is designed to minimize signal degradation, which results in a more accurate representation of the music.

Thermal management is also a critical aspect of the XP-20's design. With substantial heatsinking and ventilation provisions, the unit remains cool even during heavy use, ensuring long-term reliability and performance.

The build quality of the Pass Labs XP-20 is exceptional. The chassis is solid and well-constructed, with an aesthetic that exudes elegance and professionalism. It's available in a sleek black or silver finish, making it a stylish addition to any audio system.

In summary, the Pass Labs XP-20 is a preamplifier that exemplifies high-end audio engineering. Its combination of balanced circuitry, versatile connectivity, robust power supply, and meticulous design make it an outstanding choice for those seeking to elevate their audio experience. Whether for critical listening or casual enjoyment, the XP-20 stands as a testament to Pass Labs' dedication to audio excellence.