Where there are properly balanced connections, I think the general recommendation is to use them, instead of RCA. This is especially the case for longer runs, such as loudspeaker connections.
I’m a novice when it comes to active speakers but I read elsewhere on this forum that ‘the pre-amp output is pseudo balanced i.e. balanced impedance. Great for long runs (for example, to active loudspeakers) and cancels noise pick up’.
In my case the cables will only be 2 or 3 meters so I wonder if any benefit of XLR will be negated.
I could compare XLR and RCA and probably will at some point but initially I plan to get either or.
I don’t see any downside to using XLR if you have balanced inputs/outputs. By design, properly implemented balanced connections have superior noise rejection compared to unbalanced and this is particularly helpful for long cable runs. I use 4m XLR cables between my preamp and power amps but I can’t tell the difference between unbalanced and balanced connections in my room. Perhaps one might hear a difference if your electrical environment is noisier than mine.
At only 2 - 3 metres, the benefits of a balanced cable may not be noticeable. I had an HE and used the balanced outputs to my power amplifier. I had to buy a cable so, I thought, why not buy balanced.
I no longer have the HE, but you should refer to the user manual to get confirmation regarding whether or not the connect is balanced or pseudo balanced. I tried to do this on the Naim website but, following their recent website upgrade, I am no longer able to access any manuals. Another bug for Naim to resolve, no doubt.
On my 272/XPSDR to ATC 40A I went from RCA/XLR to DIN/XLR (with the same cable) with a clear improvement, as soon as I have the 222 I will use XLR/XLR even over short distances.
When I had active speakers with my Atom HE I tried both RCA and XLR. The XLRs were noticeably more quiet compared to the RCA cable which added more hum and noise to the signal even if only noticeable. I would always go with XLR if you have that possibility as it is far less sensitive to these kind of problems, if at all.