Those I know with the Holo Spring DAC all say that it needs something like the Singxer to work properly - so I don’t think you can eliminate it.
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Possibly the Ayre output (did you use optical or Coax?) has less jitter than the USB 2 of the Aurender. Or the decoding of USB in the Holo Spring suffers from logic induced modulation - so it works better with the Singxer or a low jitter feed from the Ayre?
Anyway I don’t have hands on experience but others have reported and advised that the Holo Spring shines best with a Singxer or other type of bridge...