Audio PC with I7-9700k on Z390 Aorus Pro wifi mb running hqplayer embedded OS to USB bridge Sig to diyinhk XMOS USB to I2S to Ian Canada FifoPi Ultimate V1 with ESS controller to ES9039Q2 Dual Mono Dac Hat to transformer IV output. Using digital attenuation, no preamp direct feed to amp.
HQplayer version 4 using 7EC mods
Amps and headphones:
tubelab TSE with #45 DHT to Sennheiser HD800