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Onkyo M501 Power Amp Binding Posts?

Applefritz's picture

This is my first message I've put on here, so please bear with me. I have an Onkyo M501 power amp, with something that I don't understand. The speaker binding posts that are on the back will not take a standard banana clip. I called Onkyo about this, but no one knew why, or what it was designed for. It looks like any other 5 way binding post I have ever seen. And I can't find my owners manual, only the service manual. So this subject is not even discussed. Can someone help me to figure this out?