X2.2 Owner’s Manual

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 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 micro-processor 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 completely separate 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.

The power supply for the X2.2 consists of a toroidal power transformer delivering an unregulated +/- 45 volts which is actively regulated before feeding passive filtering and powering the constant current sources which bias the gain stages. Each channel has its own regulation. The power supply noise reaching the circuit is on the order of one microvolt, and the little of that which gets through the circuit is rejected at the output in a balanced system. The relays and control systems are regulated independently, and all digital circuitry is isolated from the power supply.

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. The preamplifier is designed to run constantly, and will exhibit optimum measured performance within about 10 hours of turn-on.

The X2.2 consists of a single chassis.

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Pass Labs owner manual X2.2 consists of a single chassis
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X2.2 specifications

The Pass Labs X2.2 is a distinguished line-level preamplifier that showcases the meticulous engineering and design philosophy of Pass Labs. Renowned for its exceptional performance and sonic fidelity, the X2.2 is a favorite among audiophiles who demand the best in audio reproduction.

One of the key features of the X2.2 is its fully balanced differential design. This architecture minimizes noise and distortion by employing a symmetrical signal path. The outcome is an incredibly clean signal that retains the integrity of the audio source, ensuring that music is reproduced in its most authentic form. With both balanced XLR and single-ended RCA inputs and outputs, the X2.2 offers versatility in connecting a variety of audio components.

The X2.2 integrates Pass Labs’ proprietary technology, which includes a high-quality power supply featuring a toroidal transformer. This transformer design not only provides efficient energy distribution but also reduces electromagnetic interference, leading to a more stable and noise-free performance. The power supply is critically important in the overall sonic presentation of the preamplifier, and Pass has taken extra steps to ensure it’s top-notch.

Another notable aspect of the X2.2 is its zero feedback design, which enhances the preamplifier’s transparency and dynamics. By avoiding feedback mechanisms that can mask subtleties in sound, the X2.2 excels in reproducing the most delicate nuances of music, allowing listeners to engage deeply with their favorite recordings.

The build quality of the X2.2 is exceptional. It features a robust chassis that is both visually appealing and functionally effective in minimizing vibrations. The front panel is sleek and straightforward, with a minimalist aesthetic that appeals to modern sensibilities. Additionally, the unit is designed for ease of use, making it simple to navigate through its various input options.

In conclusion, the Pass Labs X2.2 is more than just a preamplifier; it is a masterful blend of innovative technology, timeless design, and high-fidelity audio performance. Its balanced design, high-quality power supply, and zero feedback architecture set it apart from competitors, making it an excellent choice for those seeking an unparalleled listening experience. Whether for critical listening or casual enjoyment, the X2.2 delivers sound that inspires and captivates, embodying the essence of high-end audio.
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