The A90D looks more Premium and unique to me. It also should a little bit warmer but also be hyper detail. I hope it is not too much of that. I wanna sink in my music, not sitting and counting the details. I prefer a smooth sounding component like my Holo Audio Spring 2 DacIn this case it might be, If you plan on listening a lot to IEMs.
Points that I saw interesting when A90D was announced are the following:
- ground lift switch on the back of the unit, in case you need it because you have a lot of ground loops in your system
- new stepped relay volume control which gets you the remote controlled volume and volume display
If you think they will benefit you, then it might be worth it.
For me, it wasn't so I am still using my original A90.
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