In my recent review of the Onkyo Muse Y‑40 streaming integrated amp (US$999.99, CA$1499, £849, €899) for SoundStage! Access, I said that while there are meaningful technological differences between the company’s Muse and Icon Series offerings, the most significant differences between the two seem to boil down to vibes—at least as far as I could tell, without having dug too deeply into the latter series.