Ground loops and other artifacts in your sound can be frustrating to troubleshoot. A cable that’s kinked just-so, or maybe just a little temperamental. Before you replace a worn out cable with the cheapest thing at the store, be sure to research your options. Upgrading to a cable with braided shielding instead of the traditional spun shielding can help prevent interference making its way to your audio output.
You can read more here: http://www.prosoundweb.com/article/church_sound_files_unbalanced_versus_balanced_signal_lines/