hope u get a well run in demo unit. I had a listen to my friend's brand new unit and I couldn't help but feel underwhelmed. something was off with the centre imaging, and seemed like it lacked the warmth and density and low end that I heard at canjam. spoke to the local dealer about it and he mentioned Aleks recommends a 100 hr running in time.
also.. I don't have the susvara anymore (the one I heard was also my friend's) but was really contemplating buying one again just to pair with the riviera. probably will wait a bit and see how the new hifiman flagship reviews.
yes whatever I'd get would be a well run demo unit but very good to know that, thx!
Susvara used can be had at relatively good prices these days, likely low risk to catch and release in case somehting else comes up; definitely worth having if the AIC is en route. either way, they scale almost all headphones amazingly. I'm now with the Caldera Closed and just love this combo; the bass and sounstage the AIC gets from the CC is incredible. Also, remember that tube rolling on this can make quite a bit of impact (with a single 12au7 tube roll, a big plus). On the two ends, try the Mullard M8136 for a lush and texture presentation (my preferred roll), and Telefunken G37R for a more analytical presentation (may user's preferred roll).