An 8X8 room can have some effect, one because of the same distance between 2 sets of parallel walls hence twice the boost(and cut) at the standing wave..you can calculate this easily after you find the exact dimentions. Also, and standing waves creating nodes and antinodes in a "SMALL ROOM" will cause more colorization in the low mids as they are are spread out more and thus more noticable. Read up on some room acoustics to figure this one out.
Also, if you have a speaker in the corner it is in "quarter space" and the bass responce is enhanced twice as much as in half space. If the speaker is up against the wall it is in "half-space and the bass will be inhanced. The HR824s are nicely equipped with a little switch on the back to compenstae for this. Try playing with this and see if it helps. It might clean up the low end a bit.
Also - dont forget that everybody loves to crank up the bass and treble knobs on their car systems, esp those Ford stock systems that never sound tremendous anyway
have fun