Protection circuits have been designed to prevent damage, and come in many flavors. They range from the simple - such as an added fuse in series with the amplifier output - to the complex, with all sorts of monitoring. The current favorite is a series relay circuit at the output of the amplifier, driven by some sort of DC detection circuit.
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at
, Added: 23 Jul 2007
http://www.geofex.com/Article_Folders/ampprot/dcprot.htm
