You are going to have to do better than that with the information. According to Whelan the ESC864 is a controller. Besides that, Whelan is a company that makes mass notification systems such as you would find used to evacuate whole towns around nuke plants. So I can believe the 4500 watt part but why it's being used where you found it and where it came from I would like to know. Also, without further information off the amp itself I have no way to answer your question.

-Hal

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