Crosslink is a Cardas classic that works so well for the price that it just doesn’t make sense to change it. Cardas has been making Crosslink for about 25 years. There are miles of it out there, installed in small to medium sized home stereos and multi-channel AV systems.
Having four conductors makes Crosslink speaker very versatile - pairs can be twisted together to increase AWG for a single-wire setup, or the four conductors can be split between lows & highs for a bi-wire speaker.