I just received my Audinst amp yesterday, and only have about 15 hours on it so far, so this is a review based on my early impressions..   This is my first serious, dedicated amp/DAC combo that I bought to power my Beyerdynamic DT 990 PRO (250 Ohm) as the FIIO E5 I had just wasn't cutting it. I'll be updating this review as the amp burns in, but I can say that at the moment, I am liking how the amp pairs with the DT990.   Review gear:  Macbook Pro > USB > Audinst HUD-MX1 > DT990   :: Looks ::   The Audinst is a small, small amp. From...