Here is a curious situation. I have a Aiyima T9 Pro (AMP) and Aiyima T10 (Preamp) which both can act as USB DAC. T9 Pro takes RCA and T10 has ouput as RCA.
PC - T10 - T9 Pro (Through RCA from T10)
I want to know if connecting two dacs like this have any advantage in refining sound signals...