bi-wiring 
noun [mass noun]
The use of two wires between an amplifier and a loudspeaker to operate the low- and high-frequency speaker circuits separately.Thus, in principle, it seems possible that bi-wiring may alter the system's frequency response....
- We began experimenting with bi-wiring back in the early '80s, an era when horizontal bi-amplification was considered the ultimate way to drive quality loudspeakers.
- I presume not since the point of bi-wiring is to keep the bass and treble separate.
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