Setup

X350.5 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 idles at about 550 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 5 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 resetable circuit breaker. 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™ X350.5 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.

Looking at the rear panel you will see the IEC 320 AC power cord receptacle, a thermal magnetic breaker switch, two pairs of output connectors, a pair of binding post connectors for remote turn-on, one RCA input connector and one XLR balanced input connector.

Make sure that the breaker switch is off (down). Plug the AC cord

X350.5 specifications

The Pass Labs X350.5 is a high-performance power amplifier renowned for its exceptional sound quality and cutting-edge technology. Designed by acclaimed audio engineer Nelson Pass, the X350.5 embodies a commitment to delivering a rich and immersive listening experience, making it a favorite among audiophiles and music enthusiasts alike.

One of the standout features of the X350.5 is its Class A/B amplifier design. This brilliant configuration allows for a balance between high efficiency and class A sound reproduction. The amplifier operates in pure Class A mode for lower power demands, providing a pristine audio signal with reduced distortion. When power requirements increase, it seamlessly transitions to Class AB operation, ensuring consistent performance across a wide range of playback levels.

The X350.5 is rated for 350 watts per channel into 8 ohms, which provides ample power to drive even the most demanding loudspeakers. Its ability to deliver 700 watts into 4 ohms ensures that dynamic peaks in music are handled effortlessly, preserving the integrity of the audio signal. This capability is further enhanced by the amplifier’s robust power supply, which features a substantial toroidal transformer and large reservoir capacitors, ensuring adequate power is always available for high transient demands.

Another defining characteristic of the X350.5 is its innovative thermal management system. The amplifier utilizes a patented biased circuit that keeps the output devices within an optimal temperature range, enhancing longevity and reliability while maintaining sound performance. The unique design also incorporates oversized heat sinks that dissipate heat efficiently, allowing the amplifier to operate cool under heavy loads.

The X350.5 features a balanced and unbalanced input configuration, making it versatile enough to integrate seamlessly into various audio setups. The careful attention to detail in the internal component quality and layout reflects Pass Labs’ dedication to minimizing noise and maximizing signal integrity.

With its sophisticated design, the Pass Labs X350.5 offers audiophiles an unrivaled listening experience, characterized by rich timbre, precise imaging, and expansive soundstage. This amplifier is not merely a piece of equipment; it's an invitation to experience music as it was meant to be heard, bringing recordings to life in the comfort of one's home. The X350.5 exemplifies Pass Labs' philosophy of combining art and precision in the pursuit of audio excellence.