Setup

You can position the amplifier anywhere you want, but it requires ventilation. We do not recommend placing it in enclosed cabinets or small closets without means for air to circulate freely. The amplifier idles at about 270 watts.

Let’s talk about power requirements. The amplifier draws about 2.3 amps (continuous rms) out of the wall during normal audio operation, and this reflects mostly the idle current that we run through the output stage. If you are driving a low impedance load, you will draw more than this, but this will not be typical.

The X250 is provided with the more conventional AC line cord, which is rated at 15 amps. The circuit ground is attached to the chassis in the conventional manner. The power input to the amplifier runs through a 3 pole RF filter which removes high frequency noise coming into and going out of the 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.

Looking at the rear panel you will see the AC power cord receptacle, a power switch, fuse holder, two pairs of output connectors, a pair of 5 way connectors for remote turn-on, two RCA input connectors and two XLR balanced input connectors.

Make sure that the power switch is off (down). Plug the AC cord into the back of the amplifier, and then into the wall. Then turn the switch on (up). The lights in your house will blink when the power supply charges the capacitors.

On the front panel, the "Standby" LED indicator should be glowing blue, indicating that the power is on. The "Power" LED should not be on. If the "Power" LED is on, don’t get excited, just use the front panel stand-by button to go to stand-by mode, with the "Standby" LED on and the "Power " LED off.

OK, so the amplifier is sitting there in stand-by mode with just the single blue LED lit. No speaker connected yet. You can go ahead and connect the source and speakers.

The amplifier can be driven single-end or balanced, if driving the amplifier single-ended leave the supplied jumpers in place (between pins 1 & 3 on the XLR).

Now that the source component is connected, make sure there is no signal coming from it, probably by turning the volume all the way down.

With the speakers connected, push the front panel button to activate the amplifier. The "Power" LED will come on.

You are ready to play music.

Do everybody a favor and try not to have shorted output cables. It happens accidentally all the time, and the amplifier is designed to survive, but I wouldn’t bet the farm on it.

Of course it’s always possible that something could go wrong. If so, don’t get excited, just relax. It’s really aggravating when something like this doesn’t work, we understand, but it will

Page 3

X250 specifications

The Pass Labs X250 is a distinguished power amplifier that showcases the brand's commitment to delivering high-quality audio performance, blending robust engineering with innovative technology. Known for its exceptional build quality and sonic capabilities, the X250 is designed for audiophiles and music enthusiasts who demand the best from their audio equipment.

At its core, the X250 is a Class A/B amplifier, which means it combines the efficiency of Class B with the superior sound quality of Class A. This hybrid design allows the amplifier to deliver high power output while maintaining low distortion levels, resulting in a clean, dynamic sound that captures the essence of the original recording. The amplifier delivers 250 watts into 8 ohms and 500 watts into 4 ohms, making it suitable for driving a wide range of loudspeakers with ease.

One of the standout features of the X250 is its use of Pass Labs' proprietary “Bias Current” technology. This innovative system optimizes performance by ensuring that the output devices operate in their most linear region, reducing crossover distortion and enhancing the amplifier's overall sound quality. This results in a more accurate and natural reproduction of audio, appealing to listeners who seek fidelity above all else.

Another notable characteristic of the X250 is its impressive dynamic range. The amplifier is designed to handle transient peaks with confidence, preserving the impact and nuance of musical passages, whether it's the delicate pluck of a guitar string or the thunderous notes of a full orchestra. The low noise floor further enhances the listening experience, allowing even the quietest details to be heard clearly.

The build quality of the X250 is equally impressive, featuring a rugged chassis and high-grade components that ensure durability and reliability. With its elegant appearance, the amplifier is not only a functional piece of equipment but also an attractive addition to any audio setup. The attention to detail in the design is evident, with a focus on minimizing vibrational interference and maintaining signal integrity.

In conclusion, the Pass Labs X250 is a remarkable power amplifier that combines advanced technology with exceptional sound quality. Its Class A/B design, Bias Current technology, and high power output make it a versatile choice for a wide range of audio applications. For those who value both performance and aesthetics, the Pass Labs X250 stands out as a superb option in the realm of high-fidelity audio amplification.