Yggy DAC

What kind of interconnects are you using? What kind of power cables? Speakers? Amps? There is a level where the resolution/transparency of the interconnect/preamp/amp is not enough to show differences between DAC sources. There are absolutely differences, but you may not be able to hear them with your current equipment/cabling.

That being said, it may be that there is not a huge difference between the two DACs you are auditioning. Based on what I have seen on the Aurender A10 internal architecture, I would think the Aurender would have more resolution.

I think you're also using the Aurender as a preamp here?  This could be driving a lot of the sound signature.

Aurender A10 Has a built in DAC. So i hook a Yaggdrasel DAC Up to A/B it. i could hear no difference at all.

Hi twoch,
I don't have any experience with Cardas, but if you're using gold-plated connectors (i.e. spades, XLR, etc.) it could be restricting resolution. Also, the tube preamp/amp may not be able to reveal the full resolution of the different DACs.  Gold-plated connectors combined with fully tube equipment may make a very warm laid back sound -- this may not be revealing enough to show micro-detail differences in source equipment.

I'm not saying this is the case, but it is possible. I don't have any experience with your two DACs. However, if you are expecting a radical change in sound, you will probably not get one unless you choose a wildly different topology that shapes the sound differently (like tube vs solid-state, or Class A vs. non Class A).

In another thread I stated how an Oppo BDP-105 sounded very similar to a custom DAC I had.  However, when placing high resolution cables in the system (solid-core OCC, rhodium plated furutech), we could definitely hear that the custom DAC was revealing sounds that the Oppo just could not produce.