Many in thread think it plays a pretty big role. I was on cusp of buying the adapter but then my speakers arrived and have been distracted ever since.I am also listening mainly with speakers, with Susvara remaining more often than not in the box.
That said, I think we tend to overemphasize differences....I'm not the most discerning listeners (as I suppose 90% here) and I listen at low volumes due to tinnitus, but with Susvara the difference between speaker tap and headphone output is definitely not night and day...
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