Like the Xs 300, this amplifier was developed through constant and thorough innovation. After years of SIT device experimentation, followed by deployment in Nelson's First Watt designs, circuit modification captured the unique tube-like sonic footprint of SITs from much higher-output MOSFET devices used in the Xs series. The result is unparalleled, fatigue-free listening enjoyment.
"Best Performance of the Year 2014"
Audio Art- Taiwan
"Super Class A Presentation,Super Class A Price Tag!"
Everything Audio Network
"Even straight from the box, they sounded very good"
Dagogo.com
Circuitus Maximus Award 2017
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Top o' the line Brutus Awards 2017
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More info - https://www.passlabs.com/amplifier/xs-150