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Are you asking about the "impedence setting" on the back of your amp/reciever?
In theory - it should not matter. Your reciever that does the A,B,A+B will assume you DONT have a volume control and will prevent the A+B setting from running in parallel (and looking like a 4 ohm speaker). Your volume control will likely also look like a 8 ohm load so I think you will be safe.
Or did I miss something about your setup?
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