The fact that one are all of your speakers are self-powered is irrelevevant to the selection of a preamp/processor. The preamp simply takes your sources (e.g., DVD, Laserdisc, VHS, Sat/Cable) and processes the sound to extract the multiple channels. What you may not need, are amplification for each channel. However, with the money you are intending to spend on your pre/pro I am surprised that you would even consider using the built in amps of your speaker unless they are the highly regarded Meridians or maybe the Paradigm Active/40s which are now discontinued.