I agree with Phil that for a 1.5 meter length, either the RCA or balanced cable should be fine. The primary advantage to balanced cables is noise reduction when you have a long run (such as in recording studios). I have used both balanced and RCA 1.0 meter interconnects between my Bryston SP-1 pre/pro and Bryston power amps, and frankly can't hear any difference the two. I ultimately opted for RCA, since they are generally less expensive than balanced, thereby allowing me to get a better quality cable. I have owned Kimber Heros, and think they are one of the two best interconnects in their general price range (the other is Alpha-Core Goertz TQ2, which replaced my Kimber Heros).
