HTS3440 Philips No Sounds from Subwoofer. I have a Philips Magnavox HTS3440 system. I am getting

Question

I have a Philips Magnavox HTS3440 system. I am getting very low audible sound from the smaller speakers and no sound from the subwoofer at all. I have tried checking the settings and there is nothing unusual/that has been changed. It used to loose sound when a loud action scene came on but now there is just no sound from the subwoofer and very little from the rest. DVD works fine. Only issues are the sound. Please help!