How to Install Outdoor Stereo Speakers in Your Garden
From Gary Altunian, former About.com Guide
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Connect Speaker Wire to Receiver and Speakers and Test the System
Strip about 1/2" of insulation from the speaker wires and connect the wires to the speakers and the receiver and turn on the system at low volume. If the system works correctly, replace the soil in the trench. If not, double-check connections and try the system again.