Pass Labs is one of the most dependable brand names when it comes to high-end audio systems. For years the brand has been recognized by audiophiles throughout the world as equipment that delivers clear and consistent quality in music.

What are the specs for the X0.2?

14dB or 20dB
Internal Gain adjustment:
Number of volume control steps:
Freq. Response
Distortion @ 1KHz:
Output Voltage:
Output Impedance:
11 volts
Input Impedance:
-80dB 20 - 20kHz
Power Supply:
Power consumption:
30 watts
3 @ 17"W x 3.5"H x 11.5"D

What else to know about the X0.2?

The X0.2 is an ultra high quality three chassis line-stage audio pre-amplifier featuring remote control and internal power supply. It combines a completely new circuit topology with traditional construction representing thirty five years of preamplifier design. This pre-amplifier flows from a commitment to create the best sounding product: a simple circuit with the most natural sonic characteristics. Derived from US Patent # 5,376,899, the X0.2 integrates power MOSFET and JFET devices in a simple Class A topology in order to deliver the finest sound possible. The Super-Symmetric gain circuitry used in the X0.2 is unique in providing superior flexibility and performance with both balanced and unbalanced inputs and outputs, converting one to the other as desired without extra circuitry and without performance degradation.

Brief History of Pass Labs

Pass Laboratories, Inc. was founded in 1991 by Nelson Pass. Operating out of his shop at home, Pass developed prototypes of a single-ended Class A amplifier design. At the same time, he and Mike Burley were constructing an in-house machine shop with three home-built CNC milling machines with which to produce the amplifiers when the design was finished.

The first product, the Aleph 0, shipped in 1992. It was a mono-block design rated at 70 watts into 8 ohms, and was unique in using three gain stages of power Mosfets including a push-pull output stage biased by a big constant current source. The amplifier operated as single-ended Class A up to its 70 watt rating and in push pull Class A at higher wattage.

At this time, Nelson hired his next-door neighbor, Elena Tong, to help with producing the amplifiers, and she manages much of the company to this day. A stereo version called the Aleph 0s followed after, along with a preamp called the Aleph P. A larger version of the Aleph 0 called the Aleph 1 shipped the following year, and was a mono-block rated at 150 watts.

Other Pass Labs Products We Often Buy

StereoBuyers has purchased tens of thousands worth Pass Labs brand equipment since 2014, with individual buys ranging from $100 to well over $50,000. If you are moving, ready to upgrade, or have Pass Labs equipment you do not or will not be using, why not contact us today to find out if it is worth good money?

If you are interested in selling your used Pass Labs equipment to us in the greater NYC area or Colorado, please click here to fill out a Free Quote Form and we will get back to you. If we agree on terms, we come to meet you where you want, and pay cash.

The following images show actual Pass Labs equipment purchased by StereoBuyers.