DV elevates the soft sounds as well which helps things sound fuller at lower volumes. If you turn DV off you will likely have to raise the volume quite a bit to get the same level of envelopment. What strength level is DV on? You can also try backing off to "light" (as opposed to disabling it completely) which will have the least amount of modulation and also adjust the Ref Levl Offset to 10db to town down DEQ and make the surrounds less overpowering.
3/6/14 at 8:32am