I looked at the descriptions and technical specs for the AZ Absolute Silver
, the Mogami 3173
(which appears to be an AES/EBU digital cable, btw, although that most likely isn’t an issue), and the output impedance specs for the non-Eclipse version of the Calypso, as indicated in Stereophile’s measurements
. I also took into account that in the Eclipse version the value of the output coupling capacitors is doubled (which would reduce output impedance significantly), and the quality of those capacitors is also apparently improved.
The bottom line is that from a purely technical standpoint I don’t see any issues with either cable, in your application, at the length you indicated. (I would not say the same thing, btw, if you were connecting the Mogami cable via RCA’s, for which the preamp’s output impedance at high frequencies is much higher than for its XLR outputs).
But given Kijanki’s comments (which I always consider to be especially credible), and given that I find the description and specs of the AZ cable to be particularly impressive, and given that the design of the AZ is substantially different than the design of the Mogami in several respects, FWIW my guess is that you are likely to realize a significant upgrade going to the AZ. Whether or not that upgrade will be worth to you the many thousands of dollars that it would apparently cost I of course can’t say.
Good luck. Regards,