I'm more of an Audio Fan than a Home Cinema Fan...
Is the .1 subw channel so independent that a pair of full size front speakers can't do the job? Can the Surround Amps/Receivers be switched to deliver the sound this way in any of the surround systems? (DD, DTS, DPLII...)
just make sure that you configure the receiver for "LARGE" speakers and turn off the LFE or SUB-OUT. This will in turn send the lower frequencies to both your front speakers.
My DVD player has a sub out (it's unusual because it has no 5.1 decoder) and has Large front setting (I have it connected no my Stereo system and sounds great!).