Like most things built to price point, including the Zen Mini and its wall-wart supply, I would imagine a better off board linear supply could potentially improve things. Then again, like a lot of things in this Audio world, as long as the owner is pleased and feels it is an improvement, that is all that matters really. In my opinion of course....
Holbo TT-Nag 110-Croft phono/Innuos Zen MK2/LinnenberG Telemann DAC-Preamp/LinnenberG Allegro monoblocs/Duevel Venus/LinnenberG Maestro SE-Senn. 660S DH Labs cabling
Croft Series 7 amps, WLM La Scala, Naim Uniti1, Naim Nait XS3, Naim ND5XS2, Guru Junior