want to replace all fours, already replaced head unit. getting impatient on ordering more from crutchfield. i want new speakers now

with that, i doubt i will get a harness from a local store. if i splice the wires to solder them into place, what color wire is what?
i see that one is blue with white stripe.
and another is blue with orange stripe.
all the speaker terminal said was A AND B. not + OR -.
thanks for your help.........tim