With separate sets of speakers, it may actually be possible to do what you are planning, although optimizing the crossover point may require some compromises or switching between two settings depending on the system being used. With a single set of speakers, the preferred approach will be to find some way to settle on a single connection. The most common approach is to use a single surround-capable receiver or pre/pro as the front end for the entire system, and then have that processor do all Dolby Digital decoding and bass management so that the sub is only connected to the processor's line level sub output. An alternate approach that might work better for you would be to set your DVD player's decoder up to not use a subwoofer and to re-route the LFE track to the mains along with any bass from other speakers (set the sub to "off," the mains to "large," and the other speakers to "small), then connect the left and right speaker cables to the sub and on to the speakers, with the sub handling bass management for the left and right channels. All of this is dependent on what hardware you have and what you are trying to achieve, of course.

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