Try to run wire to ALL the locations you think a speaker may go. Note: the wire is run in adjacent stud bays to allow movement either left or right, up or down on the same wall.
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You must use CL2 or CL3 rated wire to meet the building regulations. While there are many types of wire that are of a heavy enough gauge to carry the audio signal, if they are not CL2 or CL3 Rated they will not be approved in the electrical inspection process.
The difference between "regular" speaker wire, like the kind you see with clear jackets, is the jacket itself.
CL2 or better wire will have a jacket that doesn't burn as easily or release toxins, making it safer to use in-wall.
All of your wires in the walls of your house have to have this property.
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The common practice is to run four conductor wires from the location of the speaker switcher to each volume control. Then, from each volume control to each of the two associated speakers, a 2 conductor wire should be run.
Each speaker requires a "+" and a "-" wire. Use at least 16 gauge wire, and if the "runs" exceed 100 feet, use 14 gauge wire. Wire of 18 or smaller gauge can cause overheating of your amplifier or in extreme conditions may even damage the amplifier.
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