Should I be using balanced XLR cables from keyboard to amp? The sales guys at stores are telling me to switch and use balanced wires. Is that right? My powered speakers and my amp have XLR inputs. The 1/4 tips comes with 3 rings (balanced) or 2 rings (unbalanced). Until now I've been using just 1/4 to 1/4. Which do you use and which is better?

Comments are much appreciated.

PS I've read my manuals and I can't tell if my keyboards have balanced outputs. I have a Ensoniq, KT76, MES SK880 and a Soltron MS40.