HOW SHORT IS TOO SHORT?

I'm replacing a tube stereo amp this week with a pair of Canary M350 monoblocks. I have a set of 8 foot Cerious Technologies liquid ceramic cables and wonder if 4 foot long would make that much of a difference. I can't (nor would I) cut the cables I have now but wonder if comparable cables being shorter would make much difference. I haven't heard the amps in my system yet and have no complaints with my cables.