A tweak that improved the sound:The Enacom Noise Filter (speaker type).
Placed across the speaker terminals (across the tweeter terminals if you bi-wire), I heard an improvement in the critical Upper Midrange/ Lower Treble response.
Sweeter, but with added clarity.
Note: Do not attach this device between the Fidelium and the speaker post. This defeats the purpose of the cable's novel direct interconnect topology.
With my Edison Price terminal posts, I was able to jam the two Enacom leads into it's open top, thus avoiding contacting the Fidelium itself.
If you don't have this capability, I would recommend not doing it.
The Enacoms are pretty cheap on EBAY and as such are worth a shot.