I have after getting rid of one of my passive SVS subs I now have a couple of unused channels on my pair of 755 amps. I am considering biamping my two front channels (Klipsch RF-25 speakers). I also have a pair of RB-25 speakers (used to be for presence with Yammy 2500) I no longer use since I upgraded to the 990. I am also considering sitting the bookshelf units on top of the floorstanders and using one amp channel to power the three 6" drivers (2 from the RF-25, one from the RB-25) and one amp channel to power the horns (one horn in each of the speakers). I would toe the RF-25s in just a hair and the RB-25s in a little more. This way, I am thinking I could widen the sweet spot for the stereo imaging a little bit. Anyone see any problems with this or have any input?