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

My dealer told me to connect to the 8 ohm taps and being the stubborn as# I am I use the 4 ohm since the speakers are rated for 4 ohms. Kef Blades. Idk what the B&W is rated for but try them all if it’s become a distraction. Btw, could you post what pre amp you use? Tky

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.