I use the Xindak FP-01 Power cord for the DAC2 and Wyred 4 Sound STI-500 with excellent results. I have found the Xindak cables and power cords to be very reasonable in pricing and of very high quality. The Xindak FP-01 1.8 meter Power Cord is being sold by Pacific Valve and Electric company for $149.00. This power cord feels like power cords that are priced at 2X to 3X the price. They also have a FP-5 with new technology that was listed at $200 but recently on sale at $120 that looks really nice.
A very cheap upgrade is to improve the wall plug. I replaced mine with a hospital grade receptacle for all of $18 which is probably no different then some of the audiophile receptacles selling for $50-$75. This made and audible improvement.
I have found that the STI-500 is amazingly sensitive to minor changes in power conditioners, wall plugs and power cords. I haven't done as much experimentation with the DAC2 but plan to shortly (it has gotten all the upgrades the STI-500 got, just didn't do before and after listening sessions). I will say that the overall sound is three dimensional and uncannily real.
A very cheap upgrade is to improve the wall plug. I replaced mine with a hospital grade receptacle for all of $18 which is probably no different then some of the audiophile receptacles selling for $50-$75. This made and audible improvement.
I have found that the STI-500 is amazingly sensitive to minor changes in power conditioners, wall plugs and power cords. I haven't done as much experimentation with the DAC2 but plan to shortly (it has gotten all the upgrades the STI-500 got, just didn't do before and after listening sessions). I will say that the overall sound is three dimensional and uncannily real.