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Location, location, location.
Subwoofer positioning is critical because its entire frequency range is in the range where the room dimensions create peaks and valley in response that are spatially distributed in the room. Put the sub in a null and you get very little out of it (at that particular frequency). Put it in another site and you get a strong emphasis of another frequency. Put it in a corner and you excite all the modes which leads to increased but irregular output. (BTW. a similar phenomenon applies to finding a good spot for the listening position.)
The standard recommendation is to put the sub in the listening position, play some LF pink noise and crawl around the room until the bass response seems linear. Better is to crawl around with a mic and RTA. When you find that spot. Put the sub there, sit back and enjoy.
BTW, you might reconsider your L/R speaker setup and try to optimize it for the listening spot on the sofa. It will never sound great in the kitchen, so there's no reason to compromise the MLP for it.
Kal