When the author built his current house, he ran wires in the walls to be used for stereo speakers….

When the author built his current house, he ran wires in the walls to be used for stereo speakers. He ran wires from several different rooms to a central location, but he forgot to mark the wires so he could tell which wires emerge in which room. Explain how he was able to solve this problem and identify which wire is which.

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