Pass Labs X150.5 Manual - Explore the Superior Performance of Pass Labs 150.5 Stereo Amplifier

Introduction

X150.5 Owners Manual

The Pass Laboratories ™ X150.5 stereo amplifier embodies the design technology and refinements of the “X” series amplifiers including exten- sions of the patented Supersymmetry™ circuit. Additionally selected refinements of the XA series amplifiers have been incorporated into the X150.5 to significantly improve this products sonic performance in com- parison to it’s immediate predecessor, the Pass Laboratories™ X150.

The Supersymmetry™ circuit topology was granted a U.S. patent in 1994, and was the result of 19 years of effort by legendary analog designer and company founder Nelson Pass. The amplifier uses highly matched com- ponents in a classically simple single ended Class A circuit. The amplifier contains only two simple stages: the first is a balanced Class A gain stage. Its output drives a bank of high power devices operated as followers.

These are inherently low distortion types of circuits, but their perfor- mance is improved when operated balanced. Distortion and noise iden- tical to both halves of a balanced circuit will disappear at the output, and in a well-matched symmetric circuit, most of the distortion and noise is identical.

Supersymmetry™ enhances this effect by providing a connection be- tween the two halves of the balanced circuit that further perfects this match. Any distortion and noise not already identical to the two halves is made more identical by a factor of about 10, and the result is improved noise cancellation at the output of the amplifier.

Unlike feedback techniques where the goal is to correct for the distortion by feeding a gain stage an inversely distorted signal, Supersymmetry™ seeks merely to create perfect matching.

Matched balanced power circuitry typically sees a distortion and noise reduction of about 90% (20 dB) through a balanced connection without any additional effort. The Supersymmetry™ circuit delivers another 90% reduction, so that the X series has about 1/100 of the distortion of a conventionally simple amplifier. Distortion and noise can still be seen at the output of one half of the circuit, but since it is virtually identical on the other half, it goes away at the speaker terminals. This gives good measured performance, which because a simple circuit produces it, also sounds excellent.

Previously these kinds of simple Class A circuits have been popular for their sound quality in low power amplifiers, but have not found applica- tion at high power levels due to excessive distortion and low efficiency. Supersymmetry™ overcomes this barrier, delivering the sweetness, stag- ing, and detail of very simple circuitry up to kilowatt power levels and beyond.

X150.5 specifications

Pass Labs has long been a staple in the high-end audio industry, and the X150.5 power amplifier exemplifies the brand’s commitment to superior sound quality and innovative engineering. Designed for audiophiles seeking a blend of finesse and force, the X150.5 offers a unique array of features, technologies, and characteristics that distinguish it from its competitors.

At the heart of the X150.5 is its class A output stage, which provides an unmatched level of linearity and accuracy in sound reproduction. This design minimizes distortion, ensuring that the audio signal is as close to the original recording as possible. With 150 watts per channel into 8 ohms, and 300 watts into 4 ohms, the X150.5 delivers robust power that can drive a wide range of speakers with ease.

One of the key technologies featured in the X150.5 is Pass Labs’ unique “Super Simple” circuit design, which streamlines the signal path and reduces component count. This results in improved fidelity and a more natural sound signature. The amplifier is also equipped with a fully-balanced input stage that allows for better noise rejection, making it suitable for use in complex audio setups.

The X150.5 is known for its exceptional dynamic range and the ability to handle transient peaks without strain. This feature is crucial for maintaining the emotional impact of music, whether it’s the subtlety of a solo piano or the explosive energy of a full orchestra. Additionally, the amplifier’s high damping factor gives it precise control over speaker cones, resulting in tighter bass response and clearer mids and highs.

Constructed with both aesthetics and durability in mind, the X150.5 features a robust, solid aluminum chassis that helps to reduce vibration and electromagnetic interference. The sleek design is not only visually appealing but also functional, allowing for optimal heat dissipation. Furthermore, the amplifier employs high-quality components, including oversized power supply capacitors and gold-plated connections, ensuring longevity and reliability.

In terms of connectivity, the X150.5 offers both RCA and XLR inputs, providing flexibility for various audio sources. It also features a convenient bias adjustment system, allowing users to fine-tune the amplifier’s performance to suit their preferences.

Overall, the Pass Labs X150.5 power amplifier stands out as a remarkable piece of audio engineering that combines advanced technology with a profound understanding of music reproduction. Whether you are a seasoned audiophile or a newcomer to high-end audio, the X150.5 promises an engaging listening experience that brings your favorite music to life with stunning clarity and detail.