Low capacitance IC??

I currently having my Squeezebox2 modded and apparently in order to get the best result they recommend using very low capacitance IC that are rather short. Anyone mind explaing what capacitance means. Right now I am using analysis Plus oval 1. Overall I like them but am considering buying new IC from either Virtual Dynamics (audition) or Audio Magic (X-treme)anyone comments. Other recommendation are great. I am looking for a .5 meter pair.