For my situation, room gain gave me a natural rise in the low frequencies:
(this graph shows response with bass traps in the room, sub + mains, sub near front right corner along right wall)
So I cut down the peaks up higher and let the room gain give me a nice curve below 30Hz. I listen to a lot of music, probably more than I watch movies (although TV and video games figure in as well), so I didn't want the bass to be boomy and over-powering for music. Most bass in music is above 30~35Hz, so this curve gives me a nice rise in the deeper bass.
