Windows 7: Digital sound connection issue

Okay... I am usually good with stuff like this.. I know my way around windows settings rather well...but I'm stumped here...



I used to have a 6ch speaker set that were plugged in VIA three jacks, managed by RealTek Sound manager. all the sound was managed beautifully. Bass went to Bass speaker...
BUT they have this annoying audible buzz all the time (imagine a wasp about a foot away from your ear all the time)

SO I replaced them.


I got a new set of 6ch speakers (VideoLogic) with a Dolby Digital box. hooked it all up, turned them on and was pleased to hear nothing to start with. nice and quiet.

I then got the PC fired up and played a YouTube Video (a bass tester), and OMG it sounded bad.. nothing was managed. bass was going to the satellites and it was just nasty.

anywho...

fired up media center, set up the speakers... working properly, each speaker performed the test sound respectively

VLC Media Player - repeat of Media Center.


SO
How can I get every sound managed so that if it has bass, it goes to subwoofer? even if in stereo for MP3's and games that dont support 6ch?

Note for SNIP1.PNG - speakers also support 44.1KHz, but disabled thinking this would help. it didn't.