There are some pre-pros (Lexicon, I think) that, when placing the subs upfront next to the mains, sends the LFE to both, but only sends the left bass to the the left sub and similarly to the other. Since most xovers are at 80-90hz, I haven't seen that "feature" in any modern version (my D2v has 2 pre-outs for subs, but it is only for ARC calibration, not for re-mixing) as it is doubtful to do anything positive.

See Mojo's signature