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They are just bare wires so you can hook up whatever speaker wire or receiver you want.
Sorry, there was a problem. Please try again later.The connectors are lever push down and connect style. Push down to insert the wire and release to hold them in place. I am sure that there are ways to modify the audio cable input if you are using better grade wires than what come with the system. See this manual Insert for better clarification: To make a connection, while pressing the terminal lever, insert the wire into the hole, and then release the lever. Make sure that the terminals are gripping the bare wires, not the insulation. Link: https://www.manualslib.com/manual/302215/Onkyo-Sks-Ht870.html?page=10#manual
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