What Digital to Digital Converter Do You Use? Why?

I’ve got the Zen Stream too and am planning on getting the Singxer SU-6 as per reviews it offers a lot of performance/$. If you’re willing to spend more there are other great options from Denafrips, Musician, Matrix, etc. I’d suggest reading reviews of the SU-6 and the new Musician Phoenix at soundnews.net to get more good info on those units.

Just a couple tips in case you’re just starting to look at a DDC — whatever model you choose make sure it’s compatible with the HDMI pin configuration of your DAC or it might not work. Frustratingly there currently is no standard pin configuration for I2S applications so potential incompatibility is an issue. And with HDMI for i2S if at all possible the HDMI cable should be no longer than 1 foot or less as the signal does not travel well. I was able to find one that short at Monoprice just to get started, but several people report the cable seems to have a relatively minor effect on the sound so I may stick with it for a while before upgrading to something from DH Labs, Phasure, etc. Hope this helps, and best of luck.

I have a Singxer SU-1.  I bought because the Metrum Onyx Dac I had sounded a bit better. with the S/PDIF input.  However, I now have a Totaldac D1 core.  It sounds noticeably better with the USB input than going thru the SU-1.  Better soundstage and sonics.  

I have the Dinafrips Hermes with I2s into the Venus II DAC. With the Hermes installed 2 things stand out. The soundstage is 20% (estimated) larger wide and deeper and the Bass has much better refinement and definition.