owen,
i dont know what connectors thost are, maybe you should mail zu, but I believe they are a bit Hush Hush in naming names. I mailed them a few times with various questions on the various components used for cabling and each time their answeres were vague and no names were ever used.
its understandable though, since they are running a business.
if you want some awesome looking rca's check out this site.
http://www.homegrownaudio.com/diy_rca.html
by the way, in my DIY cable, the tubing serves no purpose with performance, but rather aesthetic benefits. manufacturers like better cables generally just heat shrink the base of the leads where the conductors split off. IMO looks cheap and ugly. the wire loom serves a purpose in cleaning it up and makes it look more professional. It also serves as a handy grip when handling the cables, though never should be used to pull out the plugs from the speaker.
The Zu cable is pretty much the same, I would assunme, i mailed them upon the subject and they told me their "ferrite look-a-like" serves no electrical purpos. Other then an aesthetic tubing. and from the looks of some pics on ebay from non zu sellers (since zu never shows any pics of their cables other then the single stock photo, which is cleaned up and exposes very little of the cables look), that ferrite look-a-like is standard wire loom, or possibly non conductive conduit, both of which can be purchased for mere pennies.
