XA200.5 Owner’s Manual

We start with simple FET circuits already having low distortion and noise, and arrange them in two symmetrical halves. The two halves of the amplifier channel are closely matched, eliminating a large portion of distortion and noise without feedback. A small amount of feedback is also applied, not so much for the purpose of reducing distortion but to make the distortion as identical as possible on both polarities of the balanced output.

It is easier to make distortions more identical than to remove them with feedback, and this is the operating principle of X amplifiers.

Since the X1000, Pass Labs products have continuously evolved toward higher performance. The Class AB “X” series was joined by the Class A “XA” amplifiers. Subsequent improvements to the Class AB “X” amplifiers resulted in the “X.5” products, and their phenomenal success has led to the Class A “XA.5” series.

As always the goal has been the best musical and objective performance possible with minimal parts in the signal path and minimal feedback. This process is not completely understood, and many of the improvements are the result of trial and error and extensive listening.

Measurement of performance is important to us, and we feel that well-designed product sounds good and measures good. Apparently it is possible to make an amplifier which measures well but which does not please the ears, and so we let our ears be the final judge.

X.5 and XA.5 amplifiers utilize the same basic circuit topology and gain devices. They differ in the sizes of the power supplies, the chassis and heat sinks, and the number of output devices. The output stages of the X.5 series are operated in heavily biased Class AB, with an idling dissipation similar to the rated output. The XA amplifiers operate pure Class A with idling dissipation more than twice the rated output.

Within any given chassis size, the X and XA amplifiers are designed to dissipate about the same power, and it is not surprising that this leads to two channel amplifiers with half the output power per channel of comparable mono amplifiers, and Class A amplifiers with half the output of Class AB amplifiers.

The X amplifiers deliver more output power per dollar, and the XA amplifiers have a better subjective performance. All of the amplifiers drive known loudspeaker loads without misbehaving, and all are unconditionally stable into low impedance and reactive loads.

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Pass Labs XA200.5 owner manual
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XA200.5 specifications

The Pass Labs XA200.5 is a distinguished power amplifier that epitomizes high-end audio engineering, renowned for its exceptional sound quality and performance. Designed to cater to audiophiles and serious music lovers, the XA200.5 combines innovative technologies with elegant craftsmanship to deliver an unparalleled listening experience.

At the core of the XA200.5 is its Class A topology, which is celebrated for its ability to produce warm, rich sound with minimal distortion. The amplifier is capable of delivering 200 watts of power into an 8-ohm load, and it can double that output for 4-ohm loads, making it suitable for driving a wide range of loudspeakers, from modest bookshelf models to demanding floor-standing designs. This impressive power reserve ensures that the XA200.5 can handle dynamic peaks effortlessly, providing a sense of authority and control over the music.

One of the standout features of the XA200.5 is its proprietary "current source" design. This technology allows the amplifier to deliver musical dynamics with precision while maintaining a linear response across the audio spectrum. Pass Labs emphasizes the importance of low signal distortion, and the XA200.5 achieves this through meticulous engineering, including high-quality components and a robust power supply. The power supply not only supports the high current demands of the amplifier but also contributes to the overall stability and performance of the unit.

The build quality of the XA200.5 is exceptional, with a substantial chassis constructed from high-grade aluminum. This not only adds to its aesthetic appeal but also enhances durability and minimizes resonance, ensuring that the internal components function optimally. The amplifier features a distinctive design with large heat sinks that facilitate efficient thermal management, keeping the unit cool even during extended playback sessions.

Another notable aspect of the XA200.5 is its single-ended input configuration, which is designed to enhance musicality. This input sensitivity allows for direct connection to source components without the need for a preamplifier, ensuring a pure signal path. Additionally, the amplifier includes balanced input options for those who prefer using balanced connections.

In summary, the Pass Labs XA200.5 is a powerhouse of an amplifier that beautifully marries technological innovation and elegant design. With its Class A operation, proprietary current source technology, and exceptional build quality, the XA200.5 delivers a remarkable audio experience that is both impactful and refined, making it a top choice for discerning audiophiles.
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