I don't have my cats at home with me, ( Long story )
Would my Bunny do the trick?
These are only my initial impressions as I have had only two days to listen to these cables:
You are quite safe with the HE-560. Unlike the HE-500 and the HE-6, the HE-560 does not seem to be too fussy when it comes to cables.
I covered the full range of the spectrum, from the Copper Venom (OCC Copper) to the Silver Poison (OCC Silver) and Silver Widow (OCC litz silver) and there are much smaller differences between these wires on the HE-560 than on the HE-6.
The main differences are: the OCC copper is a little warmer with more depth and bigger (slightly ripe) bass impact; the OCC silver is slightly lighter with more details, with wider sound-stage and tighter bass with slightly less impact. The Voicing of the HE-560 does not change much. No problems with sibilance in all cases. One issue: I was not able to completely remove a slight hardness or stridency (especially in the top range of female voice) with all cables, though I have tried only three amps so far (Vioelectric V181, Bakoon HPA-21 and HeadAmp GS-X Mk2 with Oppo 105 SACD/DAC) none of them tubes. I think this is the family sound-issue that the HE-560 share with the HR-500 and HE-6. But it is a small issue that will not bother most people--I just happen to be super sensitive to that frequency range (overtones for female voices and violins)
For this quick listening session, I would say that you are quite safe to try most of Frank's cables from OCC copper to silver-clad copper to OCC standed silver and OCC litz silver. And the sound would be between the Copper Venom (warmer with more depth, slight bass bloom with more impact) on one end and the Silver Widow (more details, with wider SS and tigther bass with reduced impact) on the other. Now, these differences are small in the case of the HE-560 so I think, once again, your are quite safe no matter what you decide.