Setup

X1 Owner’s Manual

The preamplifier main chassis / control unit has four sets of input connections, both single-ended and balanced output connections, a tape loop and a full function remote control that mirrors the front panel functions.

The main chassis also has a DB-25 connector that connects to the remote power supply and a single pair of 5-way binding posts that are used for remote amplifier turn-on. The preamplifier’s voltage and current rating are indicated on the bottom of the power supply. It will be either 240 volts, 220 volt, 120 volts, or 100 volts. A 0.5 amp 3AG slow blow fuse is provided with 100-120 volt units, and a

0.25amp slow blow fuse is provided with 220-240 volt units. The frequency rating of the power supply in all cases is 50 to 60 Hz. The preamplifier typically draws 30 watts during operation. Please verify that the pre-amplifier’s indicated voltage requirements are consistent with the voltage available at your location, prior to operation.

The main preamplifier chassis is connected to the power supply with a custom shielded cable that carries both the analog and digital power. Please note this power cable must be installed before the preamp is powered up. The power cable plugs, into and then screws into, the rear panel of the main chassis and the power supply. The connectors are a tight fit but should never need to be forced. The X1 will function with either DB-25 on the power-supply chassis. The additional DB-25 is for future performance enhancements.

We have provided a standard AC power cord that fits into the

IEC line receptacle at the right rear of the power supply chassis. The preamplifier is equipped for operation with an earth ground which is provided by the user’s AC outlet. Never defeat this ground, its use will not adversely affect the performance of this product. The chassis and circuit ground of the preamplifier are connected to earth through a power thermistor, which gives a ground connection for safety but helps avoid troublesome ground loops.

The X1 has a total of four inputs and a separate tape loop. Two of the four inputs (Input numbers 1 & 2) can be used single-ended or balanced. The other two inputs (inputs 3 & 4) are single-ended only. The tape loop has both single-ended and balanced inputs and outputs. Balanced inputs and outputs are via XLR connectors. Single-ended inputs and outputs are via RCA connectors. On the XLR connectors, pin 1 is grounded, pin 2 is the positive signal, and pin 3 is the negative signal. Left channel RCA connectors are marked with white spacers. Right channel RCA connectors are marked with a red spacers. Balanced XLR inputs and outputs are marked with “L” for left and “R” for right channel.

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Pass Labs X1 owner manual Setup
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X1 specifications

Pass Labs X1 is a high-end preamplifier that embodies the very essence of cutting-edge audio engineering, combining advanced technologies with superior craftsmanship to deliver an exceptional sonic experience. Known for its neutral and transparent sound signature, the X1 is designed to serve as the heart of a high-fidelity audio system, providing precise control over volume and input selection while ensuring signal integrity is maintained.

One of the defining features of the Pass Labs X1 is its fully differential architecture. This design not only enhances noise rejection but also minimizes distortion, resulting in a clean and accurate reproduction of music. The X1 employs a direct-coupled topology, allowing for a wider bandwidth and increased dynamic range, essential for capturing the subtleties of any audio performance.

The X1 also integrates a sophisticated power supply, utilizing separate transformer windings for the analog and digital circuits. This isolation reduces cross-contamination between sections, which is crucial for maintaining the integrity of the audio signal. The power supply is supplemented by high-quality capacitors and regulators, ensuring that the preamplifier operates with stable voltage and low noise.

In terms of connectivity, the Pass Labs X1 offers a comprehensive array of inputs and outputs, including balanced XLR and unbalanced RCA connections. This versatility allows it to interface seamlessly with a variety of sources and amplifiers, making the X1 suitable for both audiophile and professional environments. Additionally, the preamp features a remote control for added convenience, allowing users to adjust settings from a distance without compromising sound quality.

Another notable characteristic of the Pass Labs X1 is its rugged build quality. Constructed using high-grade materials and meticulously tested, the unit not only looks elegant but is designed to last, providing years of reliable performance.

Ultimately, the Pass Labs X1 is a testament to the brand's commitment to excellence in audio reproduction. Whether used in a dedicated listening room or as part of a professional setup, the X1 delivers a listening experience that is both immersive and true to the original recording, making it an invaluable component for any serious music enthusiast or audio engineer.
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