Phasing is more critical with subs. Both channels will tend to have similar bass information, because the original music will have been largely non-directional, i.e., present in both channels (reflected sound in the venue/studio). If your subs are separated by a distance equal to a half (or one and a half, etc) wavelength, they could be out of phase and their waves could cancel. One solution is to stack them. (Of course, this may not be feasible with the RELs because they fire downward and require a floor.) Drawbacks with stacking include loss of stereo imaging capability and magnet interactions if the magnets are unshielded. I have stacked subs and use VPI Magic Bricks between the subs to help shield the magnets from each other.
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