Subwoofer not working
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.
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