I have a pair of MIT T5 speaker wire and opened one of them once. The solid core wire of the (+) half of the signal is separated from the stranded wire of the (+) inside the box. The solid core (+) wire is cut, soldered to 18 ga or so wire wrapped tighly many times around a core of some kind - is that an inductor? It's like a cheap speaker crossover component. The stranded wire continues uncut to the other end of the wire; while the solid core goes through the crossover component and is soldered back to the other end. The (-) side goes untouched through the network to the other side.
