JLM,
Congrats on the Dual Core I have had mine since August 2012. Don't discount the iTube I use it with fantastic results! If you can, upgrade to a 12v linear power supply. I was using an Astron, but recently purchase a Paul Hynes SR 12/3. The dac in the Dual Core is very transparent and neutral. I compared it with a Buffalo Dac and the Dual Core was hands down a better Dac!
There is a learning curve to using the Dual Core so be patient and read the manual.
If you have any questions drop me a PM and I will be happy to help you through it.
Chris
I own the unit as well, although I only use it for its DSP feature. The Astron is a very good recommendation and if memory serves me correct, only around $100 (+ / - 10%). The 2.0 version suffers from an insufficient power supply and the Astron will make it purr.
As stated, this unit can do all sorts of things and I am only using maybe 10% of its features.
FWIW - the company will be releasing their next generation in 2016, retailing in the $3k range.
You will enjoy that piece.