Quote Originally Posted by Luvin Da Blues
I use two subs (in stereo) for the odd tunage that has freqs below what my towers produce (43Hz, - 1.5db, metered). Otherwise the sub just sits there doing nothing. Even if the tune doesn't have that low of a freq. response it still would have harmonics that might and I want to hear/feel everything on the tune.

Of course, like people have said, placement and integration is key. I spend hours with the meter and tones to get what I think is right, sounds great to my ears.
Da Blues,
There really is no such thingy as stereo bass in any sound format. Stereo only becomes apparent at frequencies of 80hz and above, and really stable at 100hz and above. Below those frequencies the wavelengths become to long for our ears to perceive any soundstage. It essentially becomes a room tone at low frequencies becomes of the room profound effect on its sound.