I am running Adam Audio A77X through Sennheiser Headphone Amp/DAC HDV820 together with HD800S. I don't use network streaming. Headphone amplifier function is not essential as I am willing to keep HDV820 if necessary even if I get another DAC. Reviews of dCS Bartok sound very much interesting to my curious mind but is sadly beyond my budget. I am not sure if Matrix Sabre Pro will perform noticeably better than HDV820. More or less the same question with Brooklyn+ DAC and I have no idea what 'linear electricity' people say is must for Brooklyn Plus is all about. (Hate to meddle with power supply thing apart from plugging in the power cable) I listen to Blues, Jazz mostly. Whatever recommendations of DACs out of own experience from you audiophiles out there will be very much appreciated. Thank you.