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The speakers could possibly have a short. It's usually caused by a strand of speaker wire touching something it shouldn't, but since you changed wire and receivers, hopefully this isn't it either, since you should have found and fixed a stray wire.
There's also the possibility that the Klipsch speakers are 4 ohm speakers (I didn't look them up), and the receiver is an 8 ohm receiver. This will cause a receiver to run hotter than usual, especially at high volumes. 4 ohm speakers require much more power to drive them, than 8 ohm speakers do. When a receiver starts getting too hot, it will go into "Protect" mode, and shut down, so you don't fry something.
Good luck figuring it out.
EDIT........
Ok, I just clicked on your link to the speakers, and see they are 8 ohm speakers. Since the problem has happened with two different receivers, but same speakers, I'd say it's the speakers, if it's not one of the speaker wires, as mentioned before. They must have a short in at least one of them. Disconnect one speaker, and test the system to see if it still goes into protect mode. If not, you know it's that speaker. If it still does, reconnect that speaker, and disconnect another one. Run the test again. Do this until it runs without going into protect mode. Once it runs without going into protect mode, whatever speaker is disconnected, is the problem. Then you can see about getting that speaker fixed or replaced.
This message has been edited since posting. Last time this message was edited on 28. August 2009 @ 11:02
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