How to Bi- Amp old McIntosh gear.

This might sound like a dumb question but....
I have a pair of Joseph Audio RM-25's which I can remove the jumpers on and run each speaker with one amp. I have 2 McIntosh MC2505's and a C-28 pre-amp. Can someone please tell me the correct or best way to wire this combo up. McIntosh says one one, Audio Classics another. When I change bass or treble, it changes it in both speakers, even though I am using right or left controls. Please put this into simple terms, thanks.

Brian