Yes there should be. I ran the supplied wall wart for about 100 hours and then tried my FiiO 50 linear Power supply on 12V mode. Not subtle the improvement.I'm going to put the IPower Elite DC 12v.
I hope there is an improvement in relation to what came with the DAC.
The thin vocals became fuller and less strident. Bass weight and slam also improved tremendously. Previously it was weak sounding on BP mode. This is running it as DAC to amp and 2 channel speakers