Hello, I just installed a creative 5.1 channel soundblaster soundcard. The problem is that when I connect it up to my 5.1 sound system, the subwoofer is not working. Everything else is working, including the centre speaker which uses the same jack as the subwoofer. Here are the details: Sound card: Creative SoundBlaster 5.1 It has 4 jacks, 3 is for output (Front, Rear, Centre/Sub) and the other one is for line in and microphone. Sound System: iBall booster 5.1 i have checked all the connection I tested the speakers with a 5.1 dvd player. Everything is working, including the subwoofer. I dont know why the subwoofer is not working when I connect it to the sound card.