I have a Denon 3802 and Kef speakers 35.2, 95c and 85s. The 85s are mounted above door height, forward of the rear wall where the listening position is.Would a change to bipolars be a good improvement, if so would eltax ht2 bipolars be a good choice? I would store the 85s for a room refit to use for surround back (wife permitting). Lastly, although it mentions dts 6.1 it doesn't mention DDEX will it work? Thanks, Ged.