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Only thing you need to do is plug it into the back and I keep my sound function on BASS. Can't really hear the subwoofer until the volume is atleast 1/4 turned up and depending on the genre of music. If it still doesn't work it could be a defective sub or jack in the stereo head.
Sorry, there was a problem. Please try again later.Hi Mekong. We regret to read that the Subwoofer for your LG 700W 2.1ch Mini Shelf System with Built-in Subwoofer and Bluetooth®, Model # CM4550 is not working and apologize for any inconveniences. Unfortunately, the unit will need to be inspected to determine why it is not working. If you are still within the store's return policy, you may want to inquire about what your options are otherwise the unit will require a repair service and our Support Representatives at our Support Center, (800) 243-0000 will be able to assist you with that...^IFV
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