The C1702 cable is a dual conductor unshielded speaker cable with polypropylene insulation and PVC jacket. The high stranding of this cable is flexible for easier installation through walls. This cable is UL compliant and designed for in-wall speakers, home theater speaker installations, and bi-amp speakers. Some speakers have the ability to connect to more than one amplifier or set of cables. Connecting two amplifiers is called bi-amping and connecting two sets of cables is called bi-wiring. A speaker set up for bi-wiring or bi-amping offers separate connections to the speaker for the upper and lower frequency driver or drivers.