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Pass Labs X150 Power Amplifier Fantastic condition inside and out. Fully functional with that great Pass Labs sound. This amplifier has been recapped by Nigel at Speakerbug. Gain: 30 db Frequency response: -0 dB at DC, -3 dB at 100 kHz Power Output: 150 W maximum @ 1% THD, 1kHz into 8 Ohms (300 W into 4 Ohms) Maximum Output Voltage: +_ 50V Maximum Output Current: +_ 20A Input impedance: 22 kohms balanced Slew Rate: +_ 50V/uS Output Noise: 300 uV unweighted 20-20 kHz Random Noise Floor: approx. 2uV Dynamic Range: 145 db (random noise floor to peak output) Balanced CMRR: -85 db DC offset:
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Pass Labs, an American high-end audio powerhouse, traces its origins to 1991 when legendary designer Nelson Pass founded the company in his California home workshop. Emerging from his earlier venture with Threshold Electronics, Pass pioneered prototypes of single-ended Class A amplifiers, enlisting collaborator Mike Burley to build custom CNC machines for production. The debut Aleph 0 model shipped in 1992, marking the start of a legacy rooted in pure, innovative solid-state amplification.
The brand focuses intently on a select range of components, excelling in power amplifiers, preamplifiers, integrated amplifiers, and phono stages, all hand-built in Auburn, California. Renowned for minimalist circuits and pure Class A topologies—often blending into Class A/B for efficiency—Pass Labs delivers exceptional warmth, detail, and realism. While they ventured briefly into headphone amplifiers like the HPA-1, their core strength lies in amplification, eschewing speakers, turntables, DACs, headphones, or cables.
Positioned firmly in the ultra-high-end market, Pass Labs commands reverence among discerning audiophiles and professionals for its uncompromising engineering, industrial aesthetic, and emotional musicality. Products embody technical precision with timeless simplicity, sustaining a reputation for quality and innovation that has endured over three decades, making them a benchmark for those seeking transcendent sound reproduction.
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