It depends on the length of the interconnect. If it's longer than one meter, then you _may_ hear an improvement with balanced. If it's one meter or less, though, I doubt you'd notice a difference in a double-blind test.
It also depends on the type of cable used. The RCA interconnect you already have is very good. If you use a REALLY cheap balanced interconnect (like a pair of generic microphone cables) you may actually be taking a step down in performance.
For the money, I think Cardas' bottom-of-the-line balanced interconnect is a terrific value. Even if you need a fairly long run, the cost would be minimal.
It also depends on the type of cable used. The RCA interconnect you already have is very good. If you use a REALLY cheap balanced interconnect (like a pair of generic microphone cables) you may actually be taking a step down in performance.
For the money, I think Cardas' bottom-of-the-line balanced interconnect is a terrific value. Even if you need a fairly long run, the cost would be minimal.