Speaker Cable

There is shielded phone wire too. I was toning out a cable, and could get "tone" from the interace terminals, and on the floor where it came out, but could not get tone, AT ALL, anywhere along the run of wire to see WHERE it was actually going. AS it turned out, someone used a cable with an aluminum or something, shield in it, and that worked great I guess, because I could not trace the wire with the Toner. I would like to find some of that, because I was INJECTING a warble tone into the line to trace with an inductive AMP, and could not get ANYTHING from the thing except at the bare ends. . . I woul use that for speaker wire.