You could try connecting to the 4ohm taps just to try - I prefer the 8ohm taps but some prefer 4ohm from what I’ve read.
I haven’t personally heard them connected to 611’s, only 601’s and they sounded good but did prefer the 1.2KW’s to these which is another story.
Have the amps had plenty of run-in time? I’d also try different positioning in you room in case they need different placement...
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