Cambridge SoundWorks MC650-IW - Manual (Page 7)

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Wiring The Speakers
Run the wires to their final positions prior to mounting the speakers.
The spring loaded terminals accept bare wire between AWG #12 and
AWG #18 (lower numbers are thicker). It is not necessary to “tin” the
wire or use connectors to terminate the wire. They will also accept
individual banana plugs.
Use at least AWG #18 speaker cable for short runs (under 15
feet). Use AWG #16 or heavier speaker cable for longer runs.
Building codes typically require plenum rated wire for installation
within walls. Be sure to use wire that complies with any
applicable local building codes. Plenum rated cable typically has
an outer jacket with individually insulated conductors inside the
outer jacket.
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Preparing The Wires
1. Strip 1/2 inch of insulation from the two individual
conductors in the speaker cable. Twist the exposed strands of bare
wire together. It is not necessary to terminate the wires with pins or
banana plugs, but you may do so if you wish.
2. Determine which conductor you will use to connect the
positive terminals of the amplifier and speaker together. Printing
or a ridge on the insulation usually distinguishes one of the two
conductors. Sometimes the metal of the conductors has two different
colors, or the insulation color of each conductor may be different.
Strip 1/2 inch