i just learned through necessity lol.. i used to not have racks just show up stack amps up then run XLRs and then speaker cables.. It was a mess to say the least. I did this to save time.. now all i do is roll rack into place, hook up power, Main XLR outputs from my mixer to rack and then speaker cables from rack to speakers and done. Once equipment is in place i need about 10 minutes to do everything else and Im playing