Hi skizuki, and welcome.
First, congrats on choosing Euforia - I'm sure you will find this amp an extremely good one (even if I am slightly biased lol!). And double congrats on having the Hugo2...this pairs superbly with Euforia and, IMHO, provides a 'better' sound (ie
smoother) than the already excellent one from H2's headphone out.
As for the RCA cable connection, this is not an easy one - for 2 reasons.
1. Some folks prefer copper, some silver. A certain degree will depend upon the rest of the system....if on the bright side, then (good!) copper might be better. Otherwise, I personally would recommend (again,
good) silver - which I've been using for years now with both Elise and Euforia. Great clarity, FR coverage, and wonderful treble handling. And I have never found silver lacking in the bass department! With my T1s (Gen1), heavily treble-oriented recordings could occasionally be a tad strident, but not enough to outweigh the advantages. But now I've replaced the cable with my own, using Neotech solid silver (and copper) UP-OCC wires, there is no such downside. As you have the Gen2 cans, treble should be less of an issue, so I would think silver to be a good choice.
2. Something that I cannot forgive Chord for, however, are their inset RCA connectors. Space is so restricted that the plugs on many top class cables
will not fit!!...unbelievable IMHO. You must ensure that the
entire length of the plug is
no more than 1.3mm (Edit : as corrected below, that should be
13 mm, of course!) in outside diameter. If they taper the slightest amount, you're in trouble!...because - another bone of contention for me - the positive contact bar inside H2 is set back
so far, that the plug's pin must travel its full length to be sure of making good contact. And so it's also a good idea to try and find cables with
long pins to their plugs, if at all possible.
Just as an aside, I personally bit the bullet in the end and decided to open it up(!!) and see if connecting direct via the
internal headphone connection (I
hate connectors!) would work...and it does lol...superbly!!
(The hp connection is vastly superior to the RCAs, IMO). By attaching extension pieces of (again) UP-OCC silver and copper wires - also in my DIY interconnects - I could then make direct wire-to-wire contact with these, and eliminate yet another connector. Easier though, of course, would be to simply attach one end of the IC cable to a very good headphone jack, if DIY inclined!
Hopefully this has given you a bit more of an idea what to look out for....and GOOD LUCK!...And happy listening when you finally receive your Euforia...CHEERS!.. CJ