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The subwoofer is dependent on a sound amp powered by an external source whereby the speakers are powered by the line output from the sound source (like a computer speaker out jack). Powered Subwoofers controlled by a power amplifier require a power source such as an AC/DC source plugged into the house power. If the device is defective or a mismatch, the subwoofer will not function. Try a new power transformer and see if that fixes the problem. Other than that, if the power transformer is good, then the woofer could be defective.
The problem is that you need the satallite speakers , they have the volume control on them which thats why you only hear the subwoofer.. yes , i tried other speakers to it and no sound either.So you will need the satellite speakers it come with..
1. Check the orange multi-pin connector the sufwoofer for a broken or bent pin. If there is a broken pin you can bypass it by cutting open the cable jacket and tap onto the affected wire with a 6 inch or so jumper, and then attach a jumper to the appropriate point inside the subwoofer. Pass the subwoofer jumper out of the case (drill a small hole) and connect it to the jumper you added to the cable.
2. Try wiggling and rapidly rotating the volume control. There are reports this control may become a problem as it ages.
3. I haven't been able to find a schematic. My only recourse was to google the output amp and the 2 op-amp packages for data sheets. They are readily on the internet. Then I laboriously traced out the stereo paths. I found that red and black fine tip felt pens were helpful in marking out the signal paths through the circuit boards.