Hi all. Lurking for a month or so, have utilized the collective brainpower to help me set up a new TV room. Speakers and receiver are bought, currently researching DVD player and subwoofer- tv will have to wait. I converted a screened-in porch to a walled-in full season den. I wired the walls for surround sound and spent a lot of time researching, agonizing, and learning. The room is 10 x 14. One of the short walls houses the entertainment center. Surround speakers mounted on the side walls. The entertainment center is a built-in that has the TV, all components, and the 3 front speakers. I made a collossal error and didn't wire any walls to patch in a subwoofer. I now realize this and it's too late to correct. I even had an electrician in this morning and he confirmed that, yes, it would be a major struggle to get a drop behind the entertainment center and to another wall. The entertainment center is about 6' high, the ceilings are 8' high. There is a 2' gap from the top of the built-in to the ceiling. I was thinking of putting my subwoofer up there. I could easily drill a hole in the top of the cabinet to run the cords to power and the receiver. It is space that we aren't going to use for anything else and has a very high WAF. My thinking was that I see all this talk about subwoofers being omnidirectional, and corner placement being good. But I searched as best I could, and saw no discussion of anyone doing anything but putting their subwoofers on the ground. So maybe my 1st ever post will be a laugher. Will this work? What are the downsides? I assume I should put some sort of rubber mat beneath it. That's no problem, as it will not be visible I believe. Should I use front- or down-firing? Will everything rattle uncontrollably? (The entertainment center is solidly built-in, heavy duty built from scratch wall to wall, no glass shelves, so I don't think everything will vibrate) Will I miss out on the floor-shaking feeling I want? Is eye-level low-freq a good thing? I suppose the answer I will get is "try it out". We'll see, but if anyone has any thoughts on how best to make this work, I'd love it. If this doesn't work, I'm not sure what plan B is. My speakers definitely need a subwoofer. Just connecting the subwoofer to the receiver by running a cord along the floor and up into the entertainment center is a wifely- no-go. Drilling holes in the front of the entertainment center to get a cord out to the baseboard won't look good either. Thanks for any responses and thanks more generally for the great community and forum.