McIntosh MC611 (terminal 2, 4, or 8 ohms)to B&W 800d3's


I would like to know when connecting from B&W 800d3 speakers to McIntosh MC611 mono-blocks which (2, 4, or 8 ohms terminal) should I use for best results? 

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one look at impedence curves for  most full range multi-way speakers will reveal the absurdity of deafly / blindly / _________ sticking to a number on an output transformer……

I'm thinking about trading my c49 for the c2700, my dealer says the c12000 is audibly clearly better...I'm just not confident my system and my hearing's close enough to justify the big step up. Reading up on the 800D3 I expect the 4 ohm taps will work best.