"Does your denon receiver have separate sub outs for L&R or does it sum as a mono signal?"
It's a fairly cheap receiver so more than likely it's a mono. My music tastes are pretty varied, but I love 70's folk and acoustic (think Simon and Garfunkel, Marshal Tucker Band, Crosby Stills and Nash, Cat Stevens, Jim Croce, etc.) but Rush, Boston, AC/DC, Metallica (and any 80's hair band you can name

) are all likely to get some time in a listening session of any length. But as much as I love music, movies are going to be a big part of this room so for that reason alone I want deep, clean, bass.