, thanks for the mention. Seems to be lots more nearfield sets ups around here than there used to be.
Cool build you have going here!! Oh the nearfeild ... I love NF and would never want to be without it again. It has me spoiled to say the least
As far as it being a bad I idea like markus767 was saying, I'd definitely have to disagree. That said though I've never tried my nearfields with the driver facing up so can't comment on that, but I have tried them with driver (and ports when I had ported subs) facing to the side as opposed to firing into the back of the couch. SQ may or may not sound better with drivers facing up vs into the back of the couch, but probably not by much if EQ'd the same. I can say though that it made a world of difference in TR and body pounding PR
with the different orientations of the driver, with it firing into the back of your seat having the most powerful effect by a wide margin. Not even comparable actually, even though FR looked almost identical and sounded about the same.
IME so far with messing with the NF's with drivers facing into back of couch over the last 3 or 4 years, I've never thought it has ever sounded muffled. In fact, if I just run the NF's only, it can sound so super clean with a pretty decent FR (mainly no peaks).
Also for me, the main benefit of the nearfield sub is to maximize TR (tactile response) and PR
(pressure response). I'm talking PR
waves that hit your body that you can really feel, not the weight type of PR
that feels like its pressuring up your ears.
If it were me I think I'd definitely go as planned with drivers and ports facing into the back of the couch with just enough room for driver excursion and not block the ports (so like a half and inch to and inch or so). With subs placed NF in this manor, it will give maximum TR and PR
waves that hit the body, if this is what your after of course. Driver facing up will probably deliver as well, but I'd be surprised if it was as strong. Again, I've never tried driver facing up. This may or may not be a bad thing if its not as strong though. There is such a thing as too much distracting and localized TR that can come from drivers facing into your back if your not careful. IME, this can be tailored to personal taste though. I'm able to accomplish this by running multiple NF's (not just one directly behind me) and FF up front as well. This will allow you control how much each location contributes.
Since this will be your only sub location (sorry if I read this wrong and you will have other sub locations as well), if it did ever become to distracting with to much localizable TR etc, you could just move your sub box back a little so the drivers wont be as close or turn the gain down, or even both. IME, even moved back a couple of inches can make a huge difference in intensity.