Setup

X150.5 Owners Manual

You can position this amplifier most anywhere you wish, but it re- quires adequate ventilation. We do not recommend placing it in enclosed cabinets or small closets without means for air to circulate freely. Stacking these power amplifiers directly upon each other is not recommended for the same reason. This amplifier typically idles at slightly more than 250 watts, most of which dissipates as heat across the heatsinks. As a point of reference, these heatsinks should never become too hot to touch for several seconds.

Let’s talk about AC power requirements. This amplifier draws about 2 amps (continuous rms) at 120 volts out of the wall during normal operation, and this power draw reflects mostly the idle current that we run through the output stage. If you are driving a low impedance load, you will draw more power than this, but this will not be typical.

The amplifier’s voltage and current rating are indicated on the rear panel. It will be 240 volts, 220 volts, 120 volts or 100 volts, all with an appropriate rear mounted replaceable type 3AG slow blow fuse. For units rated at either 220 or 240 volts the fuse will be a 2-1/2 amp type 3AG, 250V slow blow and for units rated at either 100 or 120 volts the fuse will be a 5 amp type 3AG, slow blow. Do not substitute other types, voltage, amperage or time constant fuses for the specified replacement.

The frequency rating of the AC line source in all instances will be 50 to 60 Hz. Please verify that the amplifiers indicated voltage requirements are consistent with the line voltage supplied at your location.

The Pass Laboratories™ X150.5 is provided with a conventional IEC detachable AC line cord, which is rated at 15 amps. The safety ground is attached to the chassis in the conventional approved manner. The AC power input to the amplifier runs through a RF filter, which re- moves high frequency noise coming into and going out of the ampli- fier power supply.

Under no circumstances should you defeat the ground connection of the power cord. For your safety, the chassis of the amplifier should be earth grounded. Signal ground is isolated from chassis, safety ground, to reduce the incidence of ground loop noise. The presence of a safety ground will not degrade the audio signal chain.

You may substitute an aftermarket detachable IEC 320 style power cord of your choosing; provided it is rated for at least 15 amps and it meets all legal requirements and has been approved by the local testing authority for such things.

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.