Hi, there's a number of possible sources for confusion.
I had already done a lot more experimenting with my setup. I have a set of Logitech X530 6.1 channel speakers.
Logitech X530 speakers, and probably other logitech models, have built-in bass management. That is, the receiver/amp built into the subwoofer already redirects bass signals destined for the satellite speakers to the
subwoofer speaker.
Therefore, if you turn on 'bass management' in the sound card as well, this results in confusion.
Those with speaker systems with built-in bass processsing/management should turn it off in the pc's audio setup.
Those with speakers sytems without any sort of bass processing/management will need to turn on 'bass management' in the audio setup.
Those with genuinely full-range speakers, as astralite suggests, probably don't need to do anything.
It can be hard to be sure which speaker the sound is coming from sometimes, especially with bass, but you can still test if bass is being redirected to the subwoofer. Go into the sound-volume controls and turn down the volume on each speaker, except the fronts, to zero. Now go into the audio setup. Make sure bass management is turned off.
Now place your hand in front of the subwoofer's port or, if you can't reach, tape a flap of paper over it.
*In the realtek setup you can click on the icons of the individual speakers to hear a test sound played only on that speaker.*
Click one of the front speakers. If your speaker system is redirecting bass from the front speaker to the subwoofer speaker AFTER it leaves the pc, you will feel a puff of air coming from the port of the subwoofer. You know it is being redirected externally, by the speaker system and not by the sound card, because we turned the volume of the bass channel to zero in the first step and bass management is also off.
If you didn't feel a puff of air, then turn on bass management and also put the volume of the bass channel back up to 100%. Repeat the test. You should now feel the puff of air as the bass gets redirected by the sound card from the front channel to the bass channel.
Don't forget to turn the volume back up to 100% (or your preferred level) on all the sound channels afterwards.
Hoping this helps someone, somewhere.