I would expect the Ayre to sound more articulate and revealing, while the Pass Labs will sound fuller and more musical. Both amps are built very well.
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The stage of the Pass Labs is deeper and wider. I compared Ayre and Pass laps amps for a period of 2 months. Pass Labs is superior in sound realism as well. But.....the 150.5 is the only amp I don't like of the .5 series. For this money the XA30.5 will be superior. Believe me it has enough control, even compared to the 150.5!