AFAI can see, that L17 cable does appear to have a braided co-axial sheath, so it's got most of the bases covered.
As for the DX80 - well, you have more experience of that than me, but there is no special reason (other than DSD) why the DX80 should not sound just as good as any other transport, feeding the Mojo.
Ultimately, you should
try for yourself to see if you can hear any difference feeding the Mojo with a PC USB, or smartphone USB OTG, or AK optical (or even DX80 optical!), or whatever.
Let us know if you find there is any
significant difference in sound, when trying different options to the DX80 co-axial
Also see:
http://www.head-fi.org/t/784602/chord-mojo-the-official-thread-please-read-the-3rd-post/6750#post_12155980
Differences between most transports should be very subtle, when used with Mojo; to the point of being fairly insignificant, but, just for a fun, subjective, exception:
www.head-fi.org/t/784602/chord-mojo-the-official-thread-please-read-the-3rd-post/7890#post_12203042
You are clearly bitten by the audiophile bug, so your thirst to try to get something slightly better than what you have will probably never go away! LOL
Remember that:
- the audiophile bug sometimes leads one to seek a significant difference, even when a significant difference may not actually exist, in the present reality! It can be like an itch that you can't scratch - so it is wise to be aware of this fact, for the sake of one's sanity, and for the sake of one's finances.
- the audiophile bug is always subject to the Law of Diminishing Returns (i.e. once you have reached a certain level of performance, then you have to pay big money to attain only slight improvements). So, sometimes there may actually exist a significant difference, but it may be relatively small in comparison to the big chunk of cash necessary to acquire it. But because audiophile equipment can be, literally, an addiction, a wise person will think logically about whether they are paying a big chunk of cash for a small performance difference that is, or perhaps not, worth it, or if they are at risk of paying a big chunk of cash just to gain some emotional relief from their addiction (which is not the most logical or healthiest way to deal with an addiction).
- just because one person hears a difference does not necessarily mean that you will, too & vice-versa)
.