Steve,
What Denon do you have? I have an AVR5700 I run 2.0 with full range speakers & it is quite good at rendering the phantom center. (If you haven’t tried already.) Otherwise I don’t see why not having the bookshelves side by side for a ’balanced’ center; I have done that it the past with no issue. But again that was with my very robust 5700. If your Denon can handle it, & for 'crystal clear mids for voices,' I recommend NHT or Paradigm; both from my past experience.
-E
What Denon do you have? I have an AVR5700 I run 2.0 with full range speakers & it is quite good at rendering the phantom center. (If you haven’t tried already.) Otherwise I don’t see why not having the bookshelves side by side for a ’balanced’ center; I have done that it the past with no issue. But again that was with my very robust 5700. If your Denon can handle it, & for 'crystal clear mids for voices,' I recommend NHT or Paradigm; both from my past experience.
-E