I made a pair of corner surrounds using Fostex 167's. The boxes are about 1 cu ft. When used as mains, they don't sound 1/2 2 bad as
long as the loudness is turned on. Without it, they are a little
wimpy for the fairly big room. The ports is the back into the corners
does make a difference (more bass), so I can't say how they'd be in a
regular ported box. I also made a pair of TQWT's with Fostex 207's.
Now those thing make some real bass. Its not super clear necessarily, but there's lots of it.
Chris