I have the Ares II fed by an RPI4 via USB streaming Tidal from Volumio. After 100 hours at OS-slow, today I decided to flip to NOS. I noticed a subtle difference in the high frequencies, a bit smoother, no hint of any glare on any tracks, where the OS would on rare occasions and on some tracks show a bit of an edge. Again, very subtle and a matter of personal preference. I will leave it set to NOS for a while. Amazing DAC for the money and a perfect match for my pre-amp (Schiit Freya Plus) and my speakers (Magnepan 3.6).
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I am curious about your speakers, in particular the woofers. It seems to be electrostatic panels + ribbons for mids and highs, but how are the woofers loaded?