Suppose you want your surround channels to be "full range", but don't want to add an extra channel of amplification for each surround channel (suppose it's four channels in a 7.1 setup). Instead, you're pondering the option of adding a smallish (10" maybe) "box" sub to compliment each sattelite, using passive crossovers and a common channel of amplification to drive both the sub and sat. Obviously, impedance matching, gain, crossover point, equalization, amplifier power, etc. will all be important issues to tackle. What I'm suggesting is essentially adding the driver that is left out in your sat vs. floorstanding models. This would greatly simplify amplification (four channels less), and remove the need for a four channel active crossover. In general, is this too difficult to accomplish? How would you guys approach something like this? What if you were dealing with abnormal sattelite speakers... say planar dipoles at 4 ohms? If matching an active (or seperately amplified) sub to each channel would work out well, could you approach the same result with this passive combo? I'd love to hear thoughts on this.