How does adding a second subwoofer improve your systems SQ?

Let me give you a practical example-

In my 2-channel setup I basically have only two small areas where my left and right subwoofers will fit- so positional flexibility is very limited.

I recently measured the response of each sub during my integration process.  The left sub had a dropoff below 30 Hz and small peaks above 60 Hz.  The right sub was flat down to 20Hz but lacking some impact.  
When both playing together the response is smooth and flat at my listening spot, sounds exciting, deep, dynamic and smooth.  
Having two subs is a great advantage to achieving a balanced sound if you have limited room to position them.     

@markj941,
good sum summary.  i just added two REL t9i to my system and am very happy with the sound.  they integrate very well with my large british monitors compared to two other sub brands i tried. 
an important considesrtion is distance from wall behind them.  closer than 8 inches created strong peaks in the response.