Even though the 80s reach lower on paper, I think you will both like the bass on the 660s better in your rooms.

The imaging will be sharper with easier to listen to upper mids and highs. The soundstage will also be deeper and wider. Once properly placed, I expect the 660s will acoustically disappear.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated