Quote Originally Posted by RGA
The 7NT is nice but a sub may be cheaper to integrate and may offer more depth...however one sub does not create a proper stereo image and can sometimes be difficult to integrate into the room.
Doesn't this depend on the cutoff you use? I thought for low frequencies the human ear couldn't distiguish placement (directionality). If you've got your cutoff set high, then perhaps imaging could be a problem but I've got a single sub on my sytem and yet get terrific stereo imaging.