Sub Woofer not working in 5.1 setup

[Mike_S]

TV-Server Version: N/A
MediaPortal Version: 2.2
MediaPortal Skin: Blue Two
Windows Version: XP SP2
CPU Type: AMD 3000+
HDD: Maxtor 320Gb SATA
Memory: 1Gb
Motherboard:Winfast 760GXK8MC
Motherboard Chipset:
Motherboard Bios:
Video Card: Radeon 9600XT
Video Card Driver: atimtag.sys
Sound Card: Creative Audigy 4
Sound Card AC3:
Sound Card Driver: ctaud2k.sys
1. TV Card: Pinnacle PCTV dual dvb-t Pro PCI
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote: PInnacle Remote
TV:
TV - HTPC Connection:

I have a Creative Audigy 4 sound card configured to 5.1 speakers plus sub woofer. If I use another DVD player other than MP, this works absolutely fantastically. However, with MP there is nothing coming out of the sub woofer. All the other speakers work fine.

I am using the MPA and MPV codecs (and tried some of the others available with the same result).

Is anyone able to shed some light on what I need to do?

Thanks

[Paranoid Delusion]

I have a Creative Audigy 4 sound card configured to 5.1 speakers plus sub woofer

So have i, just tried it with those codecs configured to 3 front and 2 rear and it worked fine.

Make sure that windows audio and sound device properties, are configured in the advanced tab for your speakers.

Regards