Whirlwind NL4-015 is a 15', 12 gauge, 4 conductor speaker cable with Speakon connectors. The 4 conductor cables use 12/4 SJ type wire.
Whirlwind supplies two types of multiline speaker cables: EP and NL (Speakon). Whirlwind offers 4 and 8 conductor cables in both styles and 6 conductor cables are available in the EP series.
EP cables have a male connector at one end and a female at the other. NL cables have the same connector at each end.