ohlala - If you're connecting to an unbalanced component then balanced cable provides no benefit. If it's a cable designed for an unbalanced connection that just has an XLR connector then I'd anticipate that it would perform nearly identically to a standard unbalanced cable. If it's a cable designed for a balanced connection with an RCA connector, then I'd anticipate that it might perform poorly since it's being used in the wrong application
It is sort of the other way around.
Using an XLR into an RCA adapter, with say the starquad cable one should see:
- slightly better immunity to magnetically induced signal from the starquad cancelation (Pretty subtle I would think)
- and all the CMRR advantage is lost.
- a higher amount of capacitance (maybe double?)
- probably a bit more immunity to ground loop as there is a wire and a shield (in parallel) to couple the ground between the chassis. (Maybe half?)
The main reason I would use an XLR cable in that scenario is that one could use XLR, or they could decide to use the RCA with the adapters.
Basically when the 3 wires of the XLR are made into a 2 wire system, it is equivalent to the 2 wire cable. But one cannot decombine a 2 wire cable back into a 3 wire cable.
As you know most pro audio is balanced. If you had significant runs and problems with ground loops and hum, then the XLR is your friend.
If the lengths are short, and there is not hum, then one may not hear any difference… because there probably is not any significant difference.