XLO IC - Signature

What about the XLO Signature 3.1? Does it improve compared to the 2.1?

The XLO 2.1 is an excellent IC. It improves a lot compared to the 1.1. I would suggest you to use it together with a couple of other Signature cables (e.g. 4.1B, 5.1) within the audio chain to bring out the best of XLO.

I used all these together with the Illuminati Orchid and I don't borther to try other cables since then. I won't make another move until they come out with the MK2 version. The Limited series is just way too expansive.

they were excellent 5 years ago, possibly sound dated by todays standards

iused the XLO Signature 1.1 for quite some time. It was an excellent interconnect. Very neutral, detailed with terrific dynamics, speed and wallop in the lower bass. Because of its neutrality in the mid-bass, it can sound bass shy or lean in some systems.
Presumably, the XLR version has the same characteristics as the unbalanced version. Highly recommended.