I had the chance to try the Burson OpAmp v5i on my xduoo-05 and thanks to Charles and Carlos from Burson team for approaching me if like to test their OpAmp and provide my honest evaluations to it which I welcomed that approach which clearly shows how Burson keeps seeking to hear from different people their opinions (although sound perceiving is absolutely subjective thing) just to keep tweaking and evolving their products to fulfill the audiophile passionate people to reach to their optimum fidelity in sound. Well I'm an architect as a work field...