I cant see any VIIR model. I think its IIR model as its also 5.1 speaker.

Aiya. Easy la.
All those files that you play usually have stereo sound source. Thats why you have to problem with it.

The reason for this is that most sound source from game, mp3, avi and movies are still in stereo. When you set the speaker to 5.1, it has no data at all for the rear and subwoofer. What I can suggest to you is change it to 4.1 in the speaker setting. Then try again playing all those files that you wanna play with. In this setting, the center channel will be off.

I dont really recommend using 5.1 for music as all the software do is mix the sound from the left and right, blend it together and play it. 4.1 is enough liao to create surround sound. 5.1 is only useful when you play DVD. The DD or AC3 sound format has 5 channel output and therefore by using the appropriate software like PowerDVD to convert the signal into 5.1, then only you can hear the difference especially in action picture.

BTW, if when you play your mp3 and there is no sound from the rear (after using 4.1), try Foobar2000. Go into the preference, set the "CONVERT STEREO TO 4CHANNEL" option. Not sure how Vista behaves but in XP, this shouldnt be a problem.

Sry its BT IIR...

Well the problem is even i watch dvd theres no bass as well...but when i change to 7.1 settings there is bass but VERY soft bass..most of my movies are all blu ray converted into mkv...the sound system is all 5.1 definetely not my songs problem..bcoz i tested on other pc..the surround sound is ok..even for all multimedia files..

This post has been edited by twopiece: Dec 5 2008, 11:27 AM