A lot depends on which is longer. In my experience, where I have long speaker cables (25') and short ICs, the speaker cable has made bigger differences. Also, the purpose of balanced ICs is to cancel out the effect of the cable, so the balanced IC is probably pretty good, and not as likely to yield as much improvement.
biggest difference...speaker cable or IC's?
when considering changing cables will there be a better sonic difference replacing the balanced IC's from the pre and source or by bi-wiring the speaker cable? looking to mellow the highs, but retain the detail and imaging. using horns with mcintosh in a very large room. any opinions appreciated.