installers, pro?

when people say that like to get a system to sound a certain way depends mostly on install, what exactly do they mean? do they mean as far as running wires= power, ground, rca's, etc....achieving no noise, alt whining,or whatever? or do they mean building right enclosure for subs, + or - space for whatever kind of vehicle that the install is done to? i guess if you have two sort of ~ vehicles, and get the same system installed how do you know which one will sound better?:confused: so much, yes i am. will someone de-confusify me:banghead:

all the above as well as location and how it is enclosed as well as tuning

Oh, :cool: