Mytek Dac going Ac to DC power.

I agree 100% with Erik above. I tried the "non-audiophile", affordable, built like a tank Astron, and it bettered 4 other "audiophile" power supplies I had tried, which were priced up to $995. Sounds is all that matters. Hide it on the floor behind your rack, and nobody will ever know...

The model I have been using is an Astron RS12A. Keep the 12V DC lead as short as possible. The type of wire used can make a very noticeable difference in tone, speed, clarity and extension in the highs. I have tried dozens of different types of wire, from stranded, solid core, copper, silver plated and pure silver. They all sound much different. I did not like the sound from the heavier gauge wires, or any solid core wire. Heavy gauge wire make things sound darker. 22 gauge stranded copper seemed to have very good balance. Experiment for yourself and your taste. The ultra-pure, expensive wires did not sound any better. Keep it simple. 

The Astron RS12A puts out 10 amps. The Mytek draws a constant 1.5 amps. I never saw it peak out any higher than that when in use. It does not create any problems using 22 ga. wire, unless you are using a long run, which is not suggested. My wire is less than 2 feet. The DC wire is certainly a "tuning point" for me, and different types/gauges certainly change the tone. I urge you to experiment until you find one that gives you the best synergy in your system. 

Some of the audiophile power supplies I had tried were the HD Plex 100, the Keces, the Vinnie Rossi Mini Pure DC-4EVR (ultracapacitor powered), and a Teradak power supply. Some of them may look nicer and have better specs. than the Astron, but my ears tell me which sound better, and that is all I care about. The low price is a bonus too.

tubes444:
As far as the benefits of the Astron over the internal power supply, I found it to be more dynamic/energetic, noticeably more "punch" in the bass and transient attack in the mids and highs, more extension to the upper highs (with the right DC wire). Soundstage also grew larger and had more micro details. It was a very positive improvement all around. 

Thanks for the tip on the ICT steakster, I'll look into that as well.