I just ugraded my HIfiBerry Amp+ for the Amp2 which I use installed in one of my Celestion F1 Speaker pair in my home office. Its been in there for about 3.5 years and felt it wasnt doing justice to the speakers. Wow what a difference the Amp2 is in comparison. TheDAC + which is in it seems to be smoother and overall the new amp section has a lot more grip due its higher power rating getting less distortion at higher volume and overall better much better seperation and wider soundstage. Signifcantly cheap upgrade. I have has an Amp 2 in another speaker in the bedroom but never thought it was that much better.