The physical obstacle I see with the X unit is access to adjacent receptacles on the back of a typical conditioner/regenerator, whose receptacle to receptacle spacing horizontally is typically similar. The SDFB is about 2-5/8" across, and the X unit looks similar (awaiting exact measurements from Mark). Using audio grade Furutech AC connectors next door, that leaves about 3/4" free between outlets. With an X, if outlets are at a premium, depending on one's system, something would have to give.
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