that naked wire isn't the right color. but that banana plug is nothing to brag about either.
bottom line is speaker wires are one conductor (per color). no shield, no ground. so perhaps a bastard wire was used to make the the cables and an extra conductor wasn't used.
If I needed new cables I'd buy bfa connectors and some woven audioquest knockoff wire on ebay for $10/foot and make yourself some much nicer cables for a hundred bucks or so depending on length.
Jerry