Sorry guys, between me talking to Mikhail (geat guy btw, but he was more soft spoken than what i would have expected) and just some otrher junk I had no time to reply. Yes it's true that i spent most of my time using my RnB Audio on the MPX3, but I did have some time to use the Zu's so I hope that this can be somewhate helpful to you. First I think you should read PsychoZX's review which can be found here:
http://www6.head-fi.org/forums/showthread.php?t=136316
He does a limited comparison to the Zu Mobius.
For my own impressions of the Zu Mobius, firstly I'd like to comment on asthetics. As I expected, the Zu cable is much more rigid than the Grace Five Two. The material encasing the wiring also seems to be thicker, either that or another material between the outer casing and the wire wire itself, but the RnB is much more bendable. Both cables are very good quality however.
For me the Zu cables seemed very lifeless and unengaging for example in the Josh Graoban track, "You raise me Up" the music was much more engaging. It seemed that I was an actual part of the audience. In my opinion the Zu Cable was very dry and lifeless. The sound was much more subdued with the Zu, laid back in the sense that the distance from the listener and the singer was much larger. It also did not capture Josh's vocal nuances. For example, the vibrato was there, but it seemed lifeless and lacking the richness and body that I have come to expect when listening to Josh on my Grace 5-2 and my PC speaker set up. I don't really know how to describe lifeless, but for me (and having done it) it's like the difference between sining outdoors un-miced (or in another poor aucoustic venue) as compared to a better venue like some churches or concert halls.
I also feel that the instrumental nuances were much more detailed in the RnB. I had the sense that I could here the violinists fingertips and that the RnB better articulated their bowstrokes rather than having it play back like the muzak that you'd hear in an elevator
In reference to the bass, it seemed that the Zu's clearly out did the RnB in terms of impact and slam, but the RnB's bass was much tighter and more accurate. In short, I think it's just an issue what you are looking for in your music and/or what music you listen to. Personally I listen to mostly classical and pop. If you're looking for music that emphasized more on bass slam or impact, perhaps the Zu may be a better option. However realize that these are only my own impressions, YMMV.
Just as a concluding note, I think that alot may depend on the source, s I found that listening to the MPX3 out of a couple different soruces (Onix CD-1, Sony portable, etc..) did yeild different results in souurce so I have to say that the sound production is also dependent on the type of sound that the source outputs for the listener.
Eh.. that's it for now I'll update more when my brain feels better.
PS: I'm almost done with my amp configuration.
Right now I am at the MPX3 with:
Solen 1
PIO caps
Blackgate capacitors
Partial silver wiring
Stepped attentuator
The only question mark exists with the 12V upgrade and if it would be wise to do that. There is only a $125 difference in price however.
