before putting on the speaker grilles, touch a nine volt battery to the 'input' ends of the wires... watch the speakers... If the cone moved OUT, then mark the wire according to how you put it on the battery... If it moved IN, then hook the wires to the battery the other way, rinse repeat
Do this for both speakers
We can do it my way, or we can do it my way while I yell. The choice is yours.