I have a 5.1 system, am thinking it might be nice to expand to 7.1, but I don't have a ton of space. From couch (which is up against the rear wall) to TV, it's about 11 or 12 feet.

So I had this idea that maybe I ought to scoot the couch forward about a foot, and build a narrow console-type table behind it, with the top at about the same height as the top of the couch. I could mount a pair of 3-way car speakers, pointed straight up, and I use the body of this makeshift table as an enclosure for these speakers.

Does this sound worthwhile? Crazy? If worthwhile, any tips on dimensions for the enclosure? I've never built my own speakers, so this would be new territory for me.