Common wisdom is to put dac's volume on max and use preamp's volume control. But I have no experience with dacs in my main system.
I have experience with analog source, tape deck with volume control.
I compared playing deck directly into power amp and with active preamp in between. The result was interesting. When putting the same, not the best, interconnect cables on deck and putting best interconnects between preamp and amp, I clearly preferred the sound with the preamp. However, the very best sound was when I ran deck directly into the power amp and used the best cables.
Anyway, the cables on the source are extremely important.
I have experience with analog source, tape deck with volume control.
I compared playing deck directly into power amp and with active preamp in between. The result was interesting. When putting the same, not the best, interconnect cables on deck and putting best interconnects between preamp and amp, I clearly preferred the sound with the preamp. However, the very best sound was when I ran deck directly into the power amp and used the best cables.
Anyway, the cables on the source are extremely important.