The problem is inside of the tv. Your speakers are probably fine. The problem in most sets I have found is that the internal parts/Brackets are vibrating particularly at the lower frequencies. You must insert non conducting foam and duct tape to immobilize any moving parts. With the back of the set off, Tap the chassis with your finger and you will hear where the vibrations are coming from. Repeat taping and inserting the foam until the vibrations stop or are minimized to acceptable levels. You can also adjust the custom audio with the equalizer to cut the base frequencies. This is a common problem. In some cases I have found Bad speakers and need to be replaced and is really simple to do with the back panel removed. Once you see the speakers you will how simple it is to replaced the speakers.
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