Guys, not willing to create an argument but, the SP-9001Ag seems to be VERY special. I’m not sure ordering the 9003Ag is the right move. Just because it says "6N" doesn’t mean it sounds better. According to the friend who recommended it to me, the 9003 is bound to sound less good because the conductors have an individual shield on top of the external shields common with the 9001. According to him, that additional shield around each conductor is the perfect recipe for reduced dynamics. He knows a thing or two about those things, as he builds tube electronics and high sensitivity speakers for a living. He also compared the 9001Ag to AudioNote AN-VX, AudioNote Sooto, and Neotech Nemoi 1220. According to him, the 9001Ag is much better than AN-VX, better than Neotech 1220, and comes very close to Sooto being just "a tiny bit less fruity and expressive" (his own words).
It should be noted that Neotech 1220 and 9001Ag use a very similar geometry with rectangular conductors.
Not that it wouldn’t be interesting to compare 9001 and 9003, but at the very similar prices, I wouldn’t take a chance and would just go for the 9001. It’s not clear wether one of the two should be superior to the other, maybe different uses, different preferences or the need for an extra layer of shielding in ultra polluted environments for the 9003.
That same friend has also noticed that 9001Ag sounds better for RCA with one square conductor on signal, one on return, shield connected at source end and drain wire cut flush at both ends, than using both square conductors on signal and drain wire on return. I have just sent a mail to Xangsane to ask how the finished cable using 9001Ag they sell on their website is terminated.