Todd, It doesn't matter if your wire is not marked. If you have two strands of wire joined together for the + and the -, just put some tape on one of the strands, follow the wire back to the other end, and put some tape on the same strand at the other end. Consider the taped end the + for both the speaker and the receiver and you will be ok. Do the same for the other speaker's double wire. Doesn't matter which side, unless of course you have that silver/copper looking stuff (haven't seen it in years, but they could still make it). If you have that kind, just make sure that the copper color wire always goes to the +.