Pass Labs HIFI: Audio Excellence Since 1991

Pass Labs has been crafting top-notch products in California since 1991. With a reputation for dependability, impressive power, and minimal noise, this company has become a respected and well-known brand.

Pass Labs has been crafting top-notch products in California since 1994. With a reputation for dependability, impressive power, and minimal noise, this company has become a respected and well-known brand.

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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.

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PASS LABS FAQ

XLR-to-RCA HIFI adaptersEdward DeVito2026-09-14T12:57:19-07:00

XLR-to-RCA HIFI adapters

Standard off-the-shelf XLR-to-RCA adapters may hardwire Pin 1 and Pin 3 together to maintain continuity for traditional line-level audio gear. For a phono stage input, you would need a specialty adapter where Pin 1 and Pin 3 are completely open/floating, relying exclusively on a separate external grounding terminal wire.