Some time ago I bought an Xduoo dx-05 Dac-Amp and wanted a bit more out of it, so I began to roll Op-amps in it. I am mainly using it with two of the several Headphones I own: Beyerdynamic T1 first gen and AKG K812 Carlos from Burson Audio has reached out to me couple weeks ago and offered me a review sample of the V5i dual op-amps in exchange for my honest opinion on them. Thank you Burson Audio for letting me try them. Original stock OPA 1612 compared to Burson Audio V5i dual op-amp This is a list of a few Op-amps I tried that are...