Riviera AIC-10 and also Bel Canto Class D amps I’ve been using the 300S until I got my riviera. Bel Canto has a small footprint, fits on a desk with ease and very musical.
I've heard the Riviera AIC-10 with the Susvara and it's outstanding.
I own the Auris Nirvana, so I'm obviously biased, but I love it with the Susvara; though I use it mostly these days with my other headphones (and my speaker amp with the Susvara).
I'd say that if one were focused purely on the Susvara, the AIC-10 would be superior, but at more than double the (already high) price, it must.
But for dynamic drivers, like ZMF headphones, the Nirvana sounds better to me.
That said I'd put the new Wells audio Headtrip Level III + Commander Level III (a $33,000 price tag combined) is the best I've heard the Susvara (at CanJam Chicago), a mere cost of nearly 3 AIC-10s....


