Setup

First off, let’s be clear about one thing. These amplifiers are very heavy. In the case of an X1000, we strongly suggest that you get four, not two, people to help you lift it. Yeah, maybe two people could do it, but if you get hurt, don’t say you weren’t warned. X600 and X350 models are not much lighter, either. Make the dealer lift it.

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 amplifiers all idle at about 600 watts per chassis, about the same as a hair dryer.

Let’s talk about power requirements. The amplifier draws about 5 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 hard, you will draw more than this, but this will not be typical. On this basis, we estimate that you can put two channels on a single 20 amp, 120 volt AC line without problems in most cases.

The X1000 is provided with a special standard 20 amp power cord that is not like most of the ones you are used to. It is heavier, and mates to a standard receptacle at the rear of the amplifier. It is probably not compatible with other “after-market” audiophile power cords, so be sure to check before assuming that it will fit. The power cord we provide requires the more modern high current wall sockets, so it is entirely possible that an electrician will have to come out and install new ones. A diagram of the kind of AC wall outlet required is included here.

X600 and X350 models are being provided with the more conventional AC line cord which is rated at 15 amps for your convenience.

The chassis of the X1000 is connected to the earth ground through the power cord. This is the only thing it connects to. It is not attached to the circuit or to the amplifier signal ground. This is essential to operating the amplifiers in series or parallel configurations. The X600 and X350 have their circuit grounds attached to the chassis in the conventional manner.

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. We aren’t kidding.

Series or parallel operation of X1000 amplifiers requires an interface adapter that is essential for such operation. Do not attempt to operate the X1000 in series or parallel without this interface. For more information, contact your dealer or the factory.

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

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

On the front panel, the single led indicator on the meter should be glowing blue, indicating that the power is on. The meter lights should not be on, and the meter should be parked at the left. If the meter lights are on, and the meter is up nearly to half-scale, don’t get excited, just use

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X600, X350, X1000 specifications

Pass Labs is renowned for its high-quality audio amplification equipment, and their amplifiers—like the X350, X1000, and X600—exemplify their commitment to exceptional sound reproduction and advanced engineering. Each model reflects innovative technologies and distinctive characteristics that cater to audiophiles seeking premium performance.

The Pass Labs X350 is a powerhouse that strikes a balance between power and finesse. It is a Class A amplifier, delivering 350 watts per channel into an 8-ohm load, which translates to incredible clarity and dynamic range across a variety of music genres. One of the standout features of the X350 is its use of the innovative Front End Circuitry, which enhances both linearity and low-frequency response. This ensures that the amplifier can handle complex musical passages effortlessly while retaining the natural timbre of instruments. The X350 also employs the renowned "Pure Class A" operation, resulting in minimal distortion and a warm, engaging sound signature that is particularly pleasing for long listening sessions.

In the range, the X1000 takes performance to the next level. With a staggering output of 1000 watts per channel into 8 ohms, it is designed for those who demand uncompromising power. The X1000 features a fully balanced design, providing superior common-mode rejection and eliminating unwanted noise. This model leverages advanced MOSFET technology, allowing for refined audio reproduction without sacrificing power. The robust build quality, including heavy-duty heat sinks, ensures optimal thermal management, which is vital for maintaining performance during extended use.

If you're in search of an amplifier that combines muscular performance with fine detail, the X600 is a noteworthy option. With 600 watts per channel into 8 ohms, this amplifier takes advantage of Pass Labs' patented technology to deliver nuanced sound without harshness. The X600 also incorporates a unique bias system that automatically adjusts based on the demand of the signal, maximizing efficiency and maintaining sound fidelity. This attention to detail helps in preserving the dynamic range and depth of the audio, making it suitable for both critical listening and casual enjoyment.

In summary, Pass Labs’ X350, X1000, and X600 amplifiers are masterpieces of audio engineering. They each showcase unique technologies and features that cater to a wide range of audiophile preferences—from the balanced performance of the X350, the sheer power of the X1000, to the nuanced detail of the X600. Whether for a sophisticated home theater setup or a dedicated stereo system, these amplifiers stand out for their ability to provide immersive listening experiences that are rich, dynamic, and true to the source.