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Pass Labs XA60 owner manual Introduction

Models: XA60

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Introduction

XA60 Owner’s Manual

Analog designer Nelson Pass has over the years produced some truly great solid-state amplifiers, each unique in it’s own way. Not surprisingly, the Pass Laboratories™ XA60 monoblock amplifier is no exception. The XA60’s sleek industrial design is a stunning understatement of artistic form integrated with state of the art function.

Since their introduction in 1997, the X amplifier series using the patented Supersymmetry™ circuit topology have been the mainstay of amplifier offerings from Pass Laboratories™. These amplifiers are heavily biased Class A/B designs with only two gain stages and an absolutely minimal component count in the signal path. In spite of this simplicity and thanks to the unique characteristic of the X topology, these amplifiers achieve very high power with outstanding subjective and objective performance.

With the introduction of the XA60 Pass Laboratories™ significantly raises the performance standard of excellence by introducing an entirely new series of power amplifiers. The new “XA” series of amplifiers feature a refined and elegantly simple, very highly biased, pure Class A mode of operation. This is a new and unique circuit topology that we descriptively characterize as being Single-ended Class A. This new topology combines the very best characteristics of Pass Laboratories™ “X” series amplifiers and the highly rated “Pass Laboratories Aleph™”. The XA series is the marriage of a highly refined Aleph™ output stage with the patented Supersymmetry™ “X” front end.

The emphasis of the XA series is to accentuate performance and sonic refinement over power. The XA series has the characteristic warm midrange and sweet top end of the Aleph™ product conjoined with the extreme dynamic range and definitive bass control of the X series amplifiers.

The XA60 is packaged in an artistically refined variant of the massive chassis previously reserved for the 150 watt X-150.5 two channel stereo amplifier, but running more than twice the Class A bias current of our A/B amplifiers.

The Pass Laboratories™ XA60 will deliver 60 watts rms into 8 ohms of impedance. This is the amplifiers class A limit, driving the XA60 harder or reducing the impedance of the load will not convey any additional power. Driving into a short will not convey any additional power. These are not design oversights or flaws in the XA60, but rather a condition of the very highly biased Class A operation. However; as an interesting point of reference, 60 watts driving a 87dB/1W/1m speaker will deliver well in excess of 100 dB

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Pass Labs XA60 owner manual Introduction
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XA60 specifications

Pass Labs XA60 is a high-performance audio power amplifier that epitomizes the pursuit of sonic purity and fidelity in the realm of high-end audio. It is the entry-level model in the esteemed XA series, but still incorporates many of the advanced technologies and features found in its more powerful siblings. Designed with a focus on delivering an immersive listening experience, the XA60 combines state-of-the-art engineering with superior craftsmanship.

One of the key features of the XA60 is its Class A topology, which ensures that the amplifier operates in the linear region for the entirety of its output range. This design lends itself to a warm, natural sound that captures the nuances of music without the harshness often associated with other amplifier classes. The XA60 is capable of delivering 60 watts per channel into an 8-ohm load, making it ideal for driving a variety of loudspeakers, including high-efficiency models.

The amplifier employs Pass Labs' patented "Pure Class A" output stage, which utilizes a unique biasing method to minimize crossover distortion. This innovative approach enhances the overall sonic clarity and dynamic range, allowing the XA60 to reproduce even the most complex musical passages with ease. Additionally, the amplifier is characterized by its dual-mono design, isolating the left and right channels to reduce crosstalk and interference, which ultimately results in a more focused soundstage.

Another standout characteristic of the XA60 is its massive power supply. The highly refined power supply includes large heatsinks and high-quality components that help maintain stability and reduce noise during operation. The robust thermal management ensures that the amplifier remains cool, even during extended listening sessions, thus preserving the integrity of the sound.

The build quality of the XA60 is nothing short of exceptional. Housed in a sturdy chassis, the amplifier features premium-grade connectors and a simple, yet elegant aesthetic that is typical of Pass Labs products. The thoughtful design not only ensures durability but also aids in minimizing vibration, further enhancing acoustic performance.

In summary, the Pass Labs XA60 amplifier represents a harmonious blend of advanced technologies, exceptional sound quality, and impeccable craftsmanship. With its Class A operation, dual-mono architecture, and high-quality components, the XA60 provides a nuanced, engaging listening experience that appeals to audiophiles seeking both precision and warmth in their audio systems. Whether used in a dedicated listening room or as part of a larger home audio setup, the XA60 is engineered to deliver music as it was meant to be heard.