***Reposting from the A2 Announcement thread***
Just received my A2 a few hours ago; serial number is still below 200.
While I was following this thread for quite a while, after opening a box and quick listen I felt compeled to register and share as there is definitely something to say.
A2 replaced my beloved Musical Fidelity V-CAN II in one of my systems (Musical Fidelity V-DAC II/V-PSU II/AudioQuest Cinnamon USB/Golden Gate RCA/Audirvana Plus), and first time I heard A2 I was pleasantly shocked on how good it sounded with Beyerdynamic DT990/600 Ohms!
Sound was very clean, balanced, and neutral; it was slightly darker than V-CAN II - and this seemed to work fine with DT990. A2 managed to reproduce low level details with great precision (especially highs). Also, low frequencies were much better controlled with no boominess nor distortions (V-CAN II sometimes cannot handle these correctly).
I also quickly pulled Beyerdynamic T90 (only 120+ hours) from my other system (Arcam rDAC/Musical Fidelity M1HPA/AudioQuest Cinnamon USB/AudioQuest Big Sur RCA/Audirvana Plus) but intresting enough T90 sounded not very good with A2 ((dark with slight hint of muddiness; I almost preferred DT990 sound here). Usually T90 sounds very accurate, much brighter, and more open with M1HPA. But again, having only 120 hours is way low for any critical listening so I would take this with a grain of salt.
Transformer hum. Compared to all of my other equipment that is dead silent, A2 does have some mechanical hum, although it is not loud by any means. Sitting next to MacBook Pro, Mac's noise almost overshadows its hum. If I put my ear next to it (1/2 foot or less), I can definitely hear it.
Also, mine had much stronger hum when it was cold (right out of the box, 45F or so), which kind of scared me a bit, but after warming up to room temperature it was less noticeable. After 10 min of use the temperature went up much more, which made most of the hum gone.