I can tell you that Rob Watts, the designer of the Chord DACs, says to avoid MQA and DSD... He also suggests to feed the Chord DACs with the original source files... No need to upsample or convert to other formants... The Chord DAC does upsampling internally...
I have a Lumin U1 mini feeding a Chord Qutest into a PrimaLuna tubed preamp into a McIntosh SS amp into Martin Logan ESL speakers... Sounds sublime...
I have found that streaming Qobuz and other sources at native/original resolution, as Rob suggests, sounds best to me, in my room with my system to my ears/brain...
You can try 1, 2 and 3 volts output from the DAC into your Pre... I found 2 volts sounds best in my system and gives the best range of volume control with my Pre...
I have a Lumin U1 mini feeding a Chord Qutest into a PrimaLuna tubed preamp into a McIntosh SS amp into Martin Logan ESL speakers... Sounds sublime...
I have found that streaming Qobuz and other sources at native/original resolution, as Rob suggests, sounds best to me, in my room with my system to my ears/brain...
You can try 1, 2 and 3 volts output from the DAC into your Pre... I found 2 volts sounds best in my system and gives the best range of volume control with my Pre...