Originally Posted by Doctor Morbius
If you listen to acoustic music, such as classical and jazz, the answer is yes. If you listen to electronic, rap and processed music, the answer is not so much.
After having farted around with this myself in the past few weeks, my take is let the speakers play the music and let the sub(s) do their job and carry the low end. In addition to that, the best place in your room for mid and high frequencies may not be the ideal position for low frequency due to room modes.
I listen to many kinds of music...alternative / indie, folk, Rock, Pop, acustic, folk, some electronic, world, jazz, Contemporaty Classic.
I agree the subwoofer is better to handle low frequencies...buy my AVR has a Stereo Direct that gives slighty better results in stereo, but doesn't allow any EQ or subwoofer. To use the subwoofer i have to use the Stereo mode, and not the Stereo Direct.