Anyone try Acoustic Zen cables yet?

Not much. A little more detail and soundstage depth. A little quieter background.

What did the silver give you that the copper didnt?

I auditioned both the Matrix and Silver Reference Interconnects. I compared the Matrix directly against the Harmonic Technology Pro-Silway II. There was no comparison, as the Matrix was far superior on all counts. I heard instruments with the Matrix that could not be heard through the HT. I thought both the Matrix and Silver Referenced to be superb. The detail and soundstaging are excellent. I purchased the Silver Reference from Delve Audio, replacing the Tara Lab Decade.